You were escaping an infected on this abandoned mall, running as fast as you could and trying to buy time so you could escape safely and not get turned into one, as you did so you entered a what you thought abandoned closet room and shut it close behind, you were thinking of what you needed to do to get out of this place, as the infected punched the door trying to get in...

...Then you stumbled against a big metal robot that looked at you with the only eye that seemed to work, glowing red