Works on all maps, and all you have to do is get a friend to kill theirself with their grenade in a corner. Then stand in front of them and crouch. No zombie will be able to hit you if you do it right. Let's keep this one quiet guys, this is a great glitch. :shh::shh::shh:
They definitely help, yeah. But we were still getting downed as early as round 13. It looked like the Zombies were pushing the front guy out of the glitch. We were going to try 1 prone, 1 crouch and 1 standing, but the game lagged out. Might be worth a try.
This is annoying because the zombies are trying to get the guy @ the back so like the spot in shangri la it suscks because they CAN get to him, if we find a spoit where they cant this is really awesome!