Keeping zombies in windows
All you have to do is hold down x, or whatever the use button is, and whenever a zombie starts breaking the window, while holding the button down, knife then back up then knife again and so on. As long as you time it right they should not be able to hit you. I once had about seven trying to get in at once. Ps: I would recommend that you use a smaller weapon such as an Smg or a pistol to knife faster.
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