create unique containment check for the tesla

it now functions as normal. it only checks for containment in a 10 tile radius (this should work fine for the default setups of Delta and Lambda).

code/modules/power/tesla/energy_ball.dm

@@ -63,6 +63,7 @@
 
 
 /obj/singularity/energy_ball/process()
+	determine_containment()
 	if(!orbiting)
 		handle_energy()
 
@@ -91,7 +92,6 @@
 
 /obj/singularity/energy_ball/proc/move_the_basket_ball(var/move_amount)
 	//we face the last thing we zapped, so this lets us favor that direction a bit
-	contained=0
 	var/move_bias = pick(GLOB.alldirs)
 	var/move_dir
 	for(var/rod in GLOB.grounding_rods) // grounding rods pull the tesla ball, picks the nearest one
@@ -111,8 +111,24 @@
 			setDir(move_dir)
 			for(var/mob/living/carbon/C in loc)
 				dust_mobs(C)
-		else
-			contained=1
+
+
+/obj/singularity/energy_ball/proc/determine_containment()
+	contained=0
+	var/found
+	var/tiletocheck
+	for(var/direction in GLOB.cardinals) // check a radius of 10 tiles around the ball for a full containment field
+		tiletocheck=get_step(src,direction)
+		for(var/tile in 1 to 10)
+			found=locate(/obj/machinery/field/containment) in tiletocheck
+			if(found)
+				continue
+			else if (!found && tile==10)
+				return // if one side is lacking a field it doesn't bother checking the others
+			tiletocheck=get_step(tiletocheck,direction)
+	contained=1
+	
+
 
 
 /obj/singularity/energy_ball/proc/handle_energy()