Changed floor ex_act to not break grilles & src if under r-windows.

code/game/objects/structures/grille.dm

@@ -11,7 +11,6 @@
 	var/health = 10
 	var/destroyed = 0
 	var/obj/item/stack/rods/stored
-	level = 3
 
 /obj/structure/grille/New()
 	stored = new/obj/item/stack/rods(src)

code/game/objects/structures/window.dm

@@ -307,7 +307,7 @@
 		return
 
 /obj/structure/window/proc/spawnfragments()
-	if(!loc) //if already qdel'd somehow, we do nothing
+	if(qdeleted())
 		return
 	var/turf/T = loc
 	for(var/obj/item/I in storeditems)

code/game/turfs/simulated.dm

@@ -67,8 +67,13 @@
 	var/affecting_level
 	if(severity == 1)
 		affecting_level = 1
+	else if(is_shielded())
+		affecting_level = 3
+	else if(intact)
+		affecting_level = 2
 	else
-		affecting_level = is_shielded() ? 2 : (intact ? 2 : 1)
+		affecting_level = 1
+
 	for(var/V in contents)
 		var/atom/A = V
 		if(A.level >= affecting_level)

code/game/turfs/simulated/floor.dm

@@ -48,9 +48,11 @@ var/list/icons_to_ignore_at_floor_init = list("damaged1","damaged2","damaged3","
 	return ..()
 
 /turf/simulated/floor/ex_act(severity, target)
-	..()
-	if(is_shielded())
+	if(severity != 1 && is_shielded() && target != src)
+		..()
 		return
+	else
+		..()
 	if(target == src)
 		src.ChangeTurf(src.baseturf)
 	if(target != null)