When this happens in low rounds you do not have to worry, since you can kill the zombies with a knife or grenades, and there are not many zombies, but if you are in a high round worry about getting a quick weapon or a Max Munition, knife will not die fast a zombie and there are many more zombies that come in these high rounds, if you are not in a place buy the pistol that is in the car bus, that is a very good pistol if you shoot them in the head, luck to everyone and to play!
Now that is hard mode isnt it.