Having been outside the map myself on PC on Nazi Zombies there are only a few places outside the map which dont have death barriers and they are right outside the windows. This is the only place you wont be killed if you get out the map, EVERYWHERE else you will die, its as easy as that, there is really no point in getting out the map unless you find an 'invincibility' glitch some how. Anyway, nice find and thanks for recording it