fix obvious failures.

OpenRA.Game/Actor.cs

@@ -113,6 +113,9 @@ namespace OpenRA
 			if (!World.Map.IsInMap(xy.X, xy.Y))
 				return null;
 
+			if (Destroyed)
+				return null;
+
 			var underCursor = World.FindUnitsAtMouse(mi.Location)
 				.Where(a => a.Info.Traits.Contains<TargetableInfo>())
 				.OrderByDescending(a => a.Info.Traits.Contains<SelectableInfo>() ? a.Info.Traits.Get<SelectableInfo>().Priority : int.MinValue)

OpenRA.Game/GameRules/WeaponInfo.cs

@@ -65,6 +65,7 @@ namespace OpenRA.GameRules
 		public Target target;
 		public int2 dest;
 		public int destAltitude;
+		public float firepowerModifier = 1.0f;
 	}
 
 	public interface IProjectileInfo { IEffect Create(ProjectileArgs args); }

OpenRA.Game/Orders/UnitOrderGenerator.cs

@@ -38,6 +38,7 @@ namespace OpenRA.Orders
 		public void RenderBeforeWorld(World world)
 		{
 			foreach (var a in world.Selection.Actors)
+				if (!a.Destroyed)
 					foreach (var t in a.TraitsImplementing<IPreRenderSelection>())
 						t.RenderBeforeWorld(a);
 
@@ -47,6 +48,7 @@ namespace OpenRA.Orders
 		public void RenderAfterWorld( World world )
 		{
 			foreach (var a in world.Selection.Actors)
+				if (!a.Destroyed)
 					foreach (var t in a.TraitsImplementing<IPostRenderSelection>())
 						t.RenderAfterWorld(a);
 

OpenRA.Mods.RA/AttackBase.cs

@@ -144,6 +144,10 @@ namespace OpenRA.Mods.RA
 				facing = barrel.Facing + 
 					(self.HasTrait<Turreted>() ? self.Trait<Turreted>().turretFacing :
 					facing != null ? facing.Facing : Util.GetFacing(target.CenterLocation - self.CenterLocation, 0)),
+
+				firepowerModifier = self.TraitsImplementing<IFirepowerModifier>()
+					 .Select(a => a.GetFirepowerModifier())
+					 .Product()
 			};
 			
 			ScheduleDelayedAction( FireDelay( self, self.Info.Traits.Get<AttackBaseInfo>() ), () =>

OpenRA.Mods.RA/Combat.cs

@@ -70,11 +70,6 @@ namespace OpenRA.Mods.RA
 			if (warhead.Ore)
 				world.WorldActor.Trait<ResourceLayer>().Destroy(targetTile);
 
-			var firepowerModifier = args.firedBy
-				.TraitsImplementing<IFirepowerModifier>()
-				.Select(a => a.GetFirepowerModifier())
-				.Product();
-
 			switch (warhead.DamageModel)
 			{
 				case DamageModel.Normal:
@@ -84,7 +79,7 @@ namespace OpenRA.Mods.RA
 
 						foreach (var victim in hitActors)
 						{
-							var damage = (int)GetDamageToInflict(victim, args, warhead, firepowerModifier);
+							var damage = (int)GetDamageToInflict(victim, args, warhead, args.firepowerModifier);
 							victim.InflictDamage(args.firedBy, damage, warhead);
 						}
 					} break;