There are three parts to a zombie apocalypse. Part one, The Alarm this is the point in time where the screams fill the air, the first 100 infected vastly spread and take over a large area, then comes part two, The resistance at this time the few who have prepared or how the knowledge to survive this will gather together or arm themselves individually to survive and finally part three, The Reaction at this time humanity will make its return and things shall hopefully return to the way they were before.