diff --git a/sp/src/game/server/hl2/npc_attackchopper.cpp b/sp/src/game/server/hl2/npc_attackchopper.cpp
index bc37517a..c4d716cb 100644
--- a/sp/src/game/server/hl2/npc_attackchopper.cpp
+++ b/sp/src/game/server/hl2/npc_attackchopper.cpp
@@ -3571,6 +3571,7 @@ void CNPC_AttackHelicopter::TraceAttack( const CTakeDamageInfo &info, const Vect
 	// TraceAttack() as a means for delivering blast damage. Usually when the explosive penetrates
 	// the target. (RPG missiles do this sometimes).
 	if ( ( info.GetDamageType() & DMG_AIRBOAT ) || 
+		( info.GetDamageType() & DMG_BLAST) ||
 		 ( info.GetInflictor()->Classify() == CLASS_MISSILE ) || 
 		 ( info.GetAttacker()->Classify() == CLASS_MISSILE ) )
 	{
@@ -3589,6 +3590,7 @@ int CNPC_AttackHelicopter::OnTakeDamage( const CTakeDamageInfo &info )
 	if( info.GetInflictor() != this )
 	{
 		if ( ( ( info.GetDamageType() & DMG_AIRBOAT ) == 0 ) && 
+			((info.GetDamageType() & DMG_BLAST) == 0) &&
 			( info.GetInflictor()->Classify() != CLASS_MISSILE ) && 
 			( info.GetAttacker()->Classify() != CLASS_MISSILE ) )
 			return 0;
@@ -3625,7 +3627,18 @@ int CNPC_AttackHelicopter::OnTakeDamage( const CTakeDamageInfo &info )
 
 		return BaseClass::OnTakeDamage( fudgedInfo );
 	}
+	//all other explosions do 1/5 of max health in chaos. intended to make it easier to fight helicopters when grenade guns is on.
+	//this will affect other things like the RPG, but that never comes up in regular gameplay, pretty sure
+	if (info.GetDamageType() & DMG_BLAST)
+	{
+		CTakeDamageInfo fudgedInfo = info;
+		float damage = GetMaxHealth() / 5;
+		damage = ceilf(damage);
+		fudgedInfo.SetDamage(damage);
+		fudgedInfo.SetMaxDamage(damage);
 
+		return BaseClass::OnTakeDamage(fudgedInfo);
+	}
 	return BaseClass::OnTakeDamage( info );
 }
 
diff --git a/sp/src/game/shared/baseentity_shared.cpp b/sp/src/game/shared/baseentity_shared.cpp
index 6fe05254..3623875e 100644
--- a/sp/src/game/shared/baseentity_shared.cpp
+++ b/sp/src/game/shared/baseentity_shared.cpp
@@ -1953,16 +1953,16 @@ void CBaseEntity::FireBullets( const FireBulletsInfo_t &info )
 
 #ifdef GAME_DLL
 
-	ApplyMultiDamage();
+	if (!chaos_replace_bullets_with_grenades.GetBool())//if grenade guns is on, no real "attack" has actually happened yet, so all of this code would make no sense
+	{
+		ApplyMultiDamage();
 
-	if ( IsPlayer() && flCumulativeDamage > 0.0f )
-	{
-		CBasePlayer *pPlayer = static_cast< CBasePlayer * >( this );
-		CTakeDamageInfo dmgInfo( this, pAttacker, flCumulativeDamage, nDamageType );
-		gamestats->Event_WeaponHit( pPlayer, info.m_bPrimaryAttack, pPlayer->GetActiveWeapon()->GetClassname(), dmgInfo );
-	}
-	if (!chaos_replace_bullets_with_grenades.GetBool())//if grenade guns is on, the bullet trace never actually happened, so tr.endpos is just the origin
-	{
+		if (IsPlayer() && flCumulativeDamage > 0.0f)
+		{
+			CBasePlayer *pPlayer = static_cast<CBasePlayer *>(this);
+			CTakeDamageInfo dmgInfo(this, pAttacker, flCumulativeDamage, nDamageType);
+			gamestats->Event_WeaponHit(pPlayer, info.m_bPrimaryAttack, pPlayer->GetActiveWeapon()->GetClassname(), dmgInfo);
+		}
 		if (chaos_bullet_teleport.GetBool())
 		{
 			if (IsCombatCharacter())