Physics is a science, and the observations you've scene that are different from mine just prove my point.
Kennedy's head reaction to the third shot was exactly what I would expect from a shot from behind blowing out a chunk of his skull just above his eye socket.
Educate yourself. I’m a nurse not a professor. You’re a big boy capable of doing the work. I’ll give you a hint, start with Newton’s 1st and 3rd laws of motion.