Fix some CanPass stuff

code/ZAS/Atom.dm

@@ -3,14 +3,6 @@
 /atom/var/pressure_resistance = ONE_ATMOSPHERE
 /atom/var/can_atmos_pass = ATMOS_PASS_YES
 
-// Purpose: Determines if the object can pass this atom.
-// Called by: Movement.
-// Inputs: The moving atom, target turf.
-// Outputs: Boolean if can pass.
-// Airflow and ZAS zones now uses CanZASPass() instead of this proc.
-/atom/proc/CanPass(atom/movable/mover, turf/target)
-	return !density
-
 // Purpose: Determines if airflow is allowed between T and loc.
 // Called by: Airflow.
 // Inputs: The turf the airflow is from, which may not be the same as loc. is_zone is for conditionally disallowing merging.

code/ZAS/Fire.dm

@@ -170,7 +170,7 @@ If it gains pressure too slowly, it may leak or just rupture instead of explodin
 					continue
 
 				//Spread the fire.
-				if(prob( 50 + 50 * (firelevel/vsc.fire_firelevel_multiplier) ) && my_tile.CanPass(null, enemy_tile, 0,0) && enemy_tile.CanPass(null, my_tile, 0,0))
+				if(prob( 50 + 50 * (firelevel/vsc.fire_firelevel_multiplier) ) && my_tile.CanPass(src, enemy_tile) && enemy_tile.CanPass(src, my_tile))
 					enemy_tile.create_fire(firelevel)
 
 			else