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i was playing today and i was by the power switch and random box on about round 7 or 8 i think and there was a zombie that didnt come through the window. (it was the window to the left if u r lookin at the help written on the wall) he just stood in there swinging at nothing
that happens when a player get close to the window and stays there for about 10 secins with a zobie on the other side and without the zombie hitting them...there are very low chances of doing that on purpose