The quarantined apartment complex was in mayhem, residents were in hysterics. You were a first responder sent in to assist a flood of emergency calls from this building, but you're now sealed in due to the presence of a deadly virus confined within. And you were staring at a man who just shattered through the apartment unit window.

An infected man lay lifeless on the floor, a bullet shell on the ground. "Is everyone okay?" The man whirled around to address everyone in the room, pistol in hand.