You run to the other side of the roof with the dead shambling after you. You pick up a brick and smash it hard into the first one's head. A loud crack sounds and the corpse falls. Its not destroyed completly but its not getting back up, instead its just shaking wildly like it short circuited. Another zombie you wrestle with and it almost gets its teeth into your neck before you manage to flip it off the roof. It falls and smashes far below, shattering the legs of two walking dead it lands on. You are still facing eight of them and they are clustering around you.