diff --git a/code/game/machinery/shieldgen.dm b/code/game/machinery/shieldgen.dm
index 3f6b47179c9..7cf0e63352b 100644
--- a/code/game/machinery/shieldgen.dm
+++ b/code/game/machinery/shieldgen.dm
@@ -576,7 +576,7 @@
 	return
 
 
-//////////////Contaiment Field START
+//////////////Containment Field START
 /obj/machinery/shieldwall
 		name = "Shield"
 		desc = "An energy shield."
@@ -605,6 +605,7 @@
 /obj/machinery/shieldwall/attack_hand(mob/user as mob)
 	return
 
+
 /obj/machinery/shieldwall/process()
 	if(needs_power)
 		if(isnull(gen_primary)||isnull(gen_secondary))
@@ -633,6 +634,32 @@
 	return
 
 
+/obj/machinery/shieldwall/ex_act(severity)
+	if(needs_power)
+		var/obj/machinery/shieldwallgen/G
+		switch(severity)
+			if(1.0) //big boom
+				if(prob(50))
+					G = gen_primary
+				else
+					G = gen_secondary
+				G.storedpower -= 200
+
+			if(2.0) //medium boom
+				if(prob(50))
+					G = gen_primary
+				else
+					G = gen_secondary
+				G.storedpower -= 50
+
+			if(3.0) //lil boom
+				if(prob(50))
+					G = gen_primary
+				else
+					G = gen_secondary
+				G.storedpower -= 20
+	return
+
 
 /obj/machinery/shieldwall/CanPass(atom/movable/mover, turf/target, height=0, air_group=0)
 	if(air_group || (height==0)) return 1