I wouldnt know who that is.
But my bet is Barney.
It's so sad when hit the "e" button to keep him in one spot, so the monsters attack him while you warm up the sentry gun.
Or, when you kill him for ammo. It's just sad, and he thanks you for killing him repeatably by buying you beer in the future.
Well, atleast you saved him from the snipers. 🙁