The lurker

You knee down, but only to trick him and you push him back. You run up to him, but he then punches you in the throat which causes you to start choking he then pistol whips you helm, causing it to flicker. He then gets ready for a kick, but you were able to catch his foot causing him to tumble backwards. you then lunge at him, but he trips you. He then starts running away, but by the time you stand up he is at the entrance. He takes a pistol out and starts firing, which some bullets hit your helm, and cause it to start sparking. By the time it finishes he is long gone.