You were walking down the sidewalk of a broken town, multiple dead infected around the ground, recently killed.

You looked up from the ground for a second and tripped, falling to the ground, just as a gunshot was heard and a bullet few past where your head was a second ago.

The bullet came from a building rooftop, where a man with a cigarette laying in his mouth was situated with a sniper riffle, reloading, aiming at you with the thought you were an infected.