James apparently your claim is that your interpretation of what can be seen in the head wound in the Zapruder film takes precedence over the laws of physics?
First off the Zapruder film is suspect, and secondly the laws of physics don't contradict a shot to the rear. The energy of the impact would be very small because it's a jacketed bullet, the explosive force of the exit wound would be greater than the force of the entry wound so physics actually says Kennedy's head should go backwards, not forwards.
But this is irrelevant anyways because Kennedy wasn't a test dummy but a human being, whos body was still alive when the bullet destroyed his brain and death spasms would cause more motion than any bullet impact, parsing small body movements is a fools errand.
