I was at the NW Airfield, when I saw the person I am talking about. He was standing about 250 meters away from me swapping his weapons and turning.
I hit him with my mosin twice, no reaction. I ran around him, he was still standing in the same place turned into the direction of my shots. Upon coming closer to him he turns around and does nothing. Suddenly shots come out of his weapon- I am dead.
Currently uploading a 4:34 minute video of it.