I crouch down and listen carefully. There are six of them, moving slowly around the abandoned office space I’ve entered, trying to find a way through to the center of the city. Four of the enemies are Clickers. They’re blind, so if I move very quietly, they won’t spot me with their echolocation. But then there are two Runners. Still in the first stages of infection, they can see me coming. Using a gun is out of the question: That will bring every single one of them all down on me immediately. Not only that…I don’t have enough bullets.