You were trapped inside of a town needing to find some generators to open some gates and escape, the rocky walls around the town were to high to climb, you walk around alone as you separated from the rest of the 3 survivors you came with, you hear someone screaming in agony and pain, you run to check what it was and see a girl mercilessly stabbing one of your friends guts out, she stands up before turning to you, glaring at you behind her mask before charging at you with a sharpened bloody ruler