diff --git a/reactivedrop/fgd/reactivedrop.fgd b/reactivedrop/fgd/reactivedrop.fgd
index 2694e4023..31bf59bef 100644
--- a/reactivedrop/fgd/reactivedrop.fgd
+++ b/reactivedrop/fgd/reactivedrop.fgd
@@ -149,6 +149,8 @@
 	input SetExcluded( string ) : "Change the NPC class excluded from collisions"
 	input SetInvert( integer ) : "Set the state of inversion for NPC class exclusion (0 or 1)"
 	input AllowFade( integer ) : "Enable or disable fading (0 or 1)"
+	input SetCollideWithGrenades(integer) : "Change CollideWithGrenades at runtime (0, 1 or 2)"
+	input SetCollideWithMarines(integer) : "Enable or disable marine collisions (0 or 1)"
 ]
 
 @PointClass base(prop_dynamic_base, EnableDisable) sphere(fademindist) sphere(fademaxdist) studioprop() = prop_asw_fade :
diff --git a/src/game/server/hl2/grenade_spit.cpp b/src/game/server/hl2/grenade_spit.cpp
index 8b194bcd1..88ffc2be8 100644
--- a/src/game/server/hl2/grenade_spit.cpp
+++ b/src/game/server/hl2/grenade_spit.cpp
@@ -71,7 +71,7 @@ void CGrenadeSpit::Spawn( void )
 	SetFriction( 0.8f );
 
 	SetCollisionGroup( ASW_COLLISION_GROUP_NPC_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	AddEFlags( EFL_FORCE_CHECK_TRANSMIT );
 
diff --git a/src/game/server/hl2/npc_zombine.cpp b/src/game/server/hl2/npc_zombine.cpp
index 19c9cf6de..6748cdf54 100644
--- a/src/game/server/hl2/npc_zombine.cpp
+++ b/src/game/server/hl2/npc_zombine.cpp
@@ -379,7 +379,7 @@ void CNPC_Zombine::DropGrenade( Vector vDir )
 		m_hGrenade->SetMoveType( MOVETYPE_VPHYSICS );
 		m_hGrenade->SetSolid( SOLID_VPHYSICS );
 		m_hGrenade->SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-		CFunc_ASW_Fade::DisableCollisionsWithGrenade( m_hGrenade );
+		CFunc_ASW_Fade::ApplyGrenadeCollisionRules( m_hGrenade );
 
 		m_hGrenade->CreateVPhysics();
 	}
diff --git a/src/game/server/swarm/asw_bait.cpp b/src/game/server/swarm/asw_bait.cpp
index eb88fd870..fd22e331a 100644
--- a/src/game/server/swarm/asw_bait.cpp
+++ b/src/game/server/swarm/asw_bait.cpp
@@ -7,6 +7,7 @@
 #include "asw_shareddefs.h"
 #include "ai_senses.h"
 #include "asw_gamerules.h"
+#include "func_asw_fade.h"
 
 // memdbgon must be the last include file in a .cpp file!!!
 #include "tier0/memdbgon.h"
@@ -58,6 +59,7 @@ void CASW_Bait::Spawn( void )
 	
 	SetCollisionGroup( ASW_COLLISION_GROUP_IGNORE_NPCS );
 	//CreateVPhysics();
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	// Tumble in air
 	QAngle vecAngVelocity( 0, random->RandomFloat ( -100, -500 ), 0 );
diff --git a/src/game/server/swarm/asw_flare_projectile.cpp b/src/game/server/swarm/asw_flare_projectile.cpp
index 9ffa34c49..a81a2fce7 100644
--- a/src/game/server/swarm/asw_flare_projectile.cpp
+++ b/src/game/server/swarm/asw_flare_projectile.cpp
@@ -162,7 +162,7 @@ void CASW_Flare_Projectile::Spawn( void )
 	AddFlag( FL_OBJECT );
 	
 	SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	// Tumble in air
 	QAngle vecAngVelocity( 0, random->RandomFloat ( -100, -500 ), 0 );
diff --git a/src/game/server/swarm/asw_gas_grenade_projectile.cpp b/src/game/server/swarm/asw_gas_grenade_projectile.cpp
index ade399da7..c236e589e 100644
--- a/src/game/server/swarm/asw_gas_grenade_projectile.cpp
+++ b/src/game/server/swarm/asw_gas_grenade_projectile.cpp
@@ -11,6 +11,7 @@
 #include "particle_parse.h"
 #include "asw_generic_emitter_entity.h"
 #include "asw_radiation_volume.h"
+#include "func_asw_fade.h"
 
 // memdbgon must be the last include file in a .cpp file!!!
 #include "tier0/memdbgon.h"
@@ -103,6 +104,8 @@ void CASW_Gas_Grenade_Projectile::Spawn( void )
 	
 	SetCollisionGroup( ASW_COLLISION_GROUP_IGNORE_NPCS );
 
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
+
 	// Tumble in air
 	QAngle vecAngVelocity( 0, random->RandomFloat ( -100, -500 ), 0 );
 	SetLocalAngularVelocity( vecAngVelocity );
diff --git a/src/game/server/swarm/asw_grenade_cluster.cpp b/src/game/server/swarm/asw_grenade_cluster.cpp
index 00ca55cf3..21ea824f0 100644
--- a/src/game/server/swarm/asw_grenade_cluster.cpp
+++ b/src/game/server/swarm/asw_grenade_cluster.cpp
@@ -100,7 +100,7 @@ void CASW_Grenade_Cluster::Spawn( void )
 	SetFriction( asw_vindicator_grenade_friction.GetFloat() );
 	SetElasticity( asw_vindicator_grenade_elasticity.GetFloat() );
 	SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	SetTouch( &CASW_Grenade_Cluster::VGrenadeTouch );
 
diff --git a/src/game/server/swarm/asw_grenade_prifle.cpp b/src/game/server/swarm/asw_grenade_prifle.cpp
index 95eaa861d..f531978da 100644
--- a/src/game/server/swarm/asw_grenade_prifle.cpp
+++ b/src/game/server/swarm/asw_grenade_prifle.cpp
@@ -12,6 +12,7 @@
 #include "particle_parse.h"
 #include "asw_player.h"
 #include "asw_achievements.h"
+#include "func_asw_fade.h"
 
 // memdbgon must be the last include file in a .cpp file!!!
 #include "tier0/memdbgon.h"
@@ -48,6 +49,7 @@ void CASW_Grenade_PRifle::Spawn()
 {
 	BaseClass::Spawn();
 	SetModel( STUN_GRENADE_MODEL );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 }
 
 void CASW_Grenade_PRifle::Detonate()
diff --git a/src/game/server/swarm/asw_grenade_vindicator.cpp b/src/game/server/swarm/asw_grenade_vindicator.cpp
index c92e41560..0ed097d21 100644
--- a/src/game/server/swarm/asw_grenade_vindicator.cpp
+++ b/src/game/server/swarm/asw_grenade_vindicator.cpp
@@ -95,7 +95,7 @@ void CASW_Grenade_Vindicator::Spawn( void )
 	SetFriction( asw_vindicator_grenade_friction.GetFloat() );
 	SetElasticity( asw_vindicator_grenade_elasticity.GetFloat() );
 	SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 	//CreateVPhysics();
 
 	SetTouch( &CASW_Grenade_Vindicator::VGrenadeTouch );
diff --git a/src/game/server/swarm/asw_laser_mine.cpp b/src/game/server/swarm/asw_laser_mine.cpp
index 0f6a4f6e9..190fd3f66 100644
--- a/src/game/server/swarm/asw_laser_mine.cpp
+++ b/src/game/server/swarm/asw_laser_mine.cpp
@@ -82,7 +82,7 @@ void CASW_Laser_Mine::Spawn( void )
 
 	AddEffects( EF_NOSHADOW | EF_NORECEIVESHADOW );
 	SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	SetThink( &CASW_Laser_Mine::LaserThink );
 	SetNextThink( gpGlobals->curtime + 0.1f );
diff --git a/src/game/server/swarm/asw_marine.cpp b/src/game/server/swarm/asw_marine.cpp
index aebc71d8b..14171720c 100644
--- a/src/game/server/swarm/asw_marine.cpp
+++ b/src/game/server/swarm/asw_marine.cpp
@@ -890,7 +890,7 @@ void CASW_Marine::Spawn( void )
 
 	UTIL_SetSize( this, GetHullMins(), GetHullMaxs() );
 
-	CFunc_ASW_Fade::DisableCollisionsWithMarine( this );
+	CFunc_ASW_Fade::ApplyMarineCollisionRules( this );
 }
 
 unsigned int CASW_Marine::PhysicsSolidMaskForEntity( void ) const 
diff --git a/src/game/server/swarm/asw_mine.cpp b/src/game/server/swarm/asw_mine.cpp
index 8c1070dcd..70443d668 100644
--- a/src/game/server/swarm/asw_mine.cpp
+++ b/src/game/server/swarm/asw_mine.cpp
@@ -56,7 +56,7 @@ void CASW_Mine::Spawn( void )
 	SetSolid( SOLID_BBOX );
 	AddSolidFlags( FSOLID_TRIGGER );
 	SetCollisionGroup( ASW_COLLISION_GROUP_GRENADES );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 	SetMoveType( MOVETYPE_FLYGRAVITY );
 	m_takedamage	= DAMAGE_NO;
 	m_bPrimed = false;
diff --git a/src/game/server/swarm/asw_rocket.cpp b/src/game/server/swarm/asw_rocket.cpp
index 7b4d5c7c9..c722e4a05 100644
--- a/src/game/server/swarm/asw_rocket.cpp
+++ b/src/game/server/swarm/asw_rocket.cpp
@@ -103,7 +103,7 @@ void CASW_Rocket::Spawn( void )
 	SetTouch( &CASW_Rocket::MissileTouch );
 
 	SetCollisionGroup( ASW_COLLISION_GROUP_PLAYER_MISSILE );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 	SetMoveType( MOVETYPE_FLYGRAVITY, MOVECOLLIDE_FLY_BOUNCE );
 	SetThink( &CASW_Rocket::IgniteThink );
 	
diff --git a/src/game/server/swarm/func_asw_fade.cpp b/src/game/server/swarm/func_asw_fade.cpp
index 6d9ab4196..875f5261f 100644
--- a/src/game/server/swarm/func_asw_fade.cpp
+++ b/src/game/server/swarm/func_asw_fade.cpp
@@ -12,10 +12,12 @@ LINK_ENTITY_TO_CLASS( func_asw_fade, CFunc_ASW_Fade );
 
 BEGIN_DATADESC( CFunc_ASW_Fade )
 	DEFINE_FIELD( m_bHasProxies, FIELD_BOOLEAN ),
+	DEFINE_KEYFIELD( m_nFadeOpacity, FIELD_CHARACTER, "fade_opacity" ),
 	DEFINE_KEYFIELD( m_iCollideWithGrenades, FIELD_CHARACTER, "CollideWithGrenades" ),
 	DEFINE_KEYFIELD( m_bCollideWithMarines, FIELD_BOOLEAN, "CollideWithMarines" ),
-	DEFINE_KEYFIELD( m_nFadeOpacity, FIELD_CHARACTER, "fade_opacity" ),
 	DEFINE_INPUT( m_bAllowFade, FIELD_BOOLEAN, "AllowFade" ),
+	DEFINE_INPUTFUNC( FIELD_INTEGER, "SetCollideWithGrenades", SetGrenadeCollisionRules ),
+	DEFINE_INPUTFUNC( FIELD_BOOLEAN, "SetCollideWithMarines", SetMarineCollisionRules ),
 END_DATADESC()
 
 IMPLEMENT_SERVERCLASS_ST( CFunc_ASW_Fade, DT_Func_ASW_Fade )
@@ -42,32 +44,92 @@ void CFunc_ASW_Fade::Spawn()
 	Assert( m_iCollideWithGrenades <= 2 );
 }
 
-void CFunc_ASW_Fade::DisableCollisionsWithGrenade( CBaseEntity *pGrenade )
+void CFunc_ASW_Fade::ApplyGrenadeCollisionRules( CBaseEntity* pGrenade )
 {
-	float flGrenadeZ = pGrenade->GetAbsOrigin().z;
-	string_t iszClassName = AllocPooledString( "func_asw_fade" );
+	const float flGrenadeZ = pGrenade->GetAbsOrigin().z;
+	const string_t iszClassName = AllocPooledString( "func_asw_fade" );
 
-	CFunc_ASW_Fade *pCeiling = NULL;
-	while ( ( pCeiling = assert_cast< CFunc_ASW_Fade * >( gEntList.FindEntityByClassnameFast( pCeiling, iszClassName ) ) ) != NULL )
+	CFunc_ASW_Fade* pCeiling = nullptr;
+	while ( ( pCeiling = assert_cast<CFunc_ASW_Fade*>(
+		gEntList.FindEntityByClassnameFast( pCeiling, iszClassName ) ) ) != nullptr )
 	{
-		if ( ( pCeiling->m_iCollideWithGrenades == 0 && pCeiling->GetAbsOrigin().z >= flGrenadeZ ) || pCeiling->m_iCollideWithGrenades == 2 )
+		const bool bShouldDisable =
+			( pCeiling->m_iCollideWithGrenades == 0 && pCeiling->GetAbsOrigin().z >= flGrenadeZ ) ||
+			( pCeiling->m_iCollideWithGrenades == 2 );
+
+		const bool bCurrentlyDisabled = PhysEntityCollisionsAreDisabled( pCeiling, pGrenade );
+
+		if ( bShouldDisable && !bCurrentlyDisabled )
 		{
 			PhysDisableEntityCollisions( pCeiling, pGrenade );
 		}
+		else if ( !bShouldDisable && bCurrentlyDisabled )
+		{
+			PhysEnableEntityCollisions( pCeiling, pGrenade );
+		}
 	}
 }
 
-void CFunc_ASW_Fade::DisableCollisionsWithMarine( CBaseEntity *pMarine )
+void CFunc_ASW_Fade::ApplyMarineCollisionRules( CBaseEntity* pMarine )
 {
-	string_t iszClassName = AllocPooledString( "func_asw_fade" );
+	const string_t iszClassName = AllocPooledString( "func_asw_fade" );
 
-	CFunc_ASW_Fade *pCeiling = NULL;
-	while ( ( pCeiling = assert_cast< CFunc_ASW_Fade * >( gEntList.FindEntityByClassnameFast( pCeiling, iszClassName ) ) ) != NULL )
+	CFunc_ASW_Fade* pCeiling = nullptr;
+	while ( ( pCeiling = assert_cast<CFunc_ASW_Fade*>(
+		gEntList.FindEntityByClassnameFast( pCeiling, iszClassName ) ) ) != nullptr )
 	{
-		if ( !pCeiling->m_bCollideWithMarines )
+		const bool bShouldDisable = !pCeiling->m_bCollideWithMarines;
+		const bool bCurrentlyDisabled = PhysEntityCollisionsAreDisabled( pCeiling, pMarine );
+
+		if ( bShouldDisable && !bCurrentlyDisabled )
 		{
 			PhysDisableEntityCollisions( pCeiling, pMarine );
 		}
+		else if ( !bShouldDisable && bCurrentlyDisabled )
+		{
+			PhysEnableEntityCollisions( pCeiling, pMarine );
+		}
+	}
+}
+
+void CFunc_ASW_Fade::SetGrenadeCollisionRules( inputdata_t& inputdata )
+{
+	m_iCollideWithGrenades = clamp( inputdata.value.Int(), 0, 2 );
+
+	static const char* pszExplosiveClasses[] = {
+		"asw_mine",
+		"npc_grenade_frag",
+		"asw_rocket",
+        "grenadespit",
+		"asw_missile_round",
+		"asw_grenade_cluster",
+		"asw_flare_projectile",
+		"asw_laser_mine",
+		"asw_grenade_vindicator",
+		"asw_gas_grenade_projectile",
+        "asw_bait",
+        "asw_grenade_prifle",
+		nullptr
+	};
+
+	for ( const char** pszClass = pszExplosiveClasses; *pszClass; ++pszClass )
+	{
+		CBaseEntity* pGrenade = NULL;
+		while ( ( pGrenade = gEntList.FindEntityByClassname( pGrenade, *pszClass ) ) != NULL )
+		{
+			ApplyGrenadeCollisionRules( pGrenade );
+		}
+	}
+}
+
+void CFunc_ASW_Fade::SetMarineCollisionRules( inputdata_t& inputdata )
+{
+	m_bCollideWithMarines = !!inputdata.value.Int();
+
+	CBaseEntity* pMarine = NULL;
+	while ( ( pMarine = gEntList.FindEntityByClassname( pMarine, "asw_marine" ) ) != NULL )
+	{
+		ApplyMarineCollisionRules( pMarine );
 	}
 }
 
diff --git a/src/game/server/swarm/func_asw_fade.h b/src/game/server/swarm/func_asw_fade.h
index 055fb4e7c..0eaa65326 100644
--- a/src/game/server/swarm/func_asw_fade.h
+++ b/src/game/server/swarm/func_asw_fade.h
@@ -21,8 +21,11 @@ class CFunc_ASW_Fade : public CFuncBrush
 	virtual void Spawn() override;
 	bool ShouldFade( CASW_Inhabitable_NPC *pNPC );
 
-	static void DisableCollisionsWithGrenade( CBaseEntity *pGrenade );
-	static void DisableCollisionsWithMarine( CBaseEntity *pMarine );
+	static void ApplyGrenadeCollisionRules( CBaseEntity *pGrenade );
+	static void ApplyMarineCollisionRules( CBaseEntity *pMarine );
+
+	void SetGrenadeCollisionRules( inputdata_t& inputdata );
+	void SetMarineCollisionRules( inputdata_t& inputdata );
 
 	CNetworkVar( bool, m_bHasProxies );
 	// 0 = only when grenade spawns above the brush
diff --git a/src/game/shared/swarm/asw_missile_round_shared.cpp b/src/game/shared/swarm/asw_missile_round_shared.cpp
index 4b4e3f106..a86460eb8 100644
--- a/src/game/shared/swarm/asw_missile_round_shared.cpp
+++ b/src/game/shared/swarm/asw_missile_round_shared.cpp
@@ -95,7 +95,7 @@ void CASW_Missile_Round::Spawn( void )
 	SetSolid( SOLID_NONE );
 	SetGravity( m_ShotDef.m_flGravity );
 	SetCollisionGroup( ASW_COLLISION_GROUP_ALIEN_MISSILE );
-	CFunc_ASW_Fade::DisableCollisionsWithGrenade( this );
+	CFunc_ASW_Fade::ApplyGrenadeCollisionRules( this );
 
 	SetTouch( &CASW_Missile_Round::Touch );