i would assume the shot to the groin folded him up...a quick second shot went in the back as he was falling...
the ballistics report should clear that up? Mattis the reporter described two shots - the first he said was after KR pulled his gun up and away from redshirt grabbing it. That could be the head graze that looks like a bullet wound? Mattis also said that he saw one shot go to ground. sparked? So guessing that’s when KB lowered the weapon back down? speculating.