GoW 2 Pavilion Boomshield Glitch

Okay then, on pavillion, on team game modes (not wingman) at the back of each spawn there are two archways with solid doors. Go to the top middle of the map and grab the boomshield. Go to one of those "Doors" and keep edging back as you try to plant the boomshield. When it plants it will dissapear, just tap A to take cover on the boomshield and then jump over it, And blam! you are on the other side of the once solid door!