DISCOUNT! SHOOT THROUGH WALL BUG

I DISCOVERED THIS BUG 1 WEEK AGO AND I BOOSTED AN ACCOUNT FROM 223 ARENA POINTS TO 301 IN JUST 1 DAY!
I SELL THE BUG HERE (0,50€ Only): [Only registered and activated users can see links. Click Here To Register...]

Is it the build glitch when you make a door and edit away top part so you can shoot?