There were 2 head shots that occurred nearly simultaneously. The shot from behind came first, but it was only a tiny fraction of a second before the shot from the front. If you study the film closely, watching it in slow motion, you'll clearly see his head move forward, then abruptly reverse to move to his right rear. This happens almost simultaneously, indicating that opposing forces impacted his head nearly simultaneously. Science dictates that a single force couldn't be responsible for these abrupt, opposing movements.
The head movement proves that there was more than one head shot, and is corroborated by the fact that JFK had 2 head wounds. One was a small entrance wound, the other,....... a large, gaping wound. Both wounds were in the back of his head.
There were a total of 4 small entrance wounds in JFK and John Connally ( JFK had a small entrance wound in the back of his head, in his upper back and in his throat,....Connally had one small entrance wound ), and one gaping wound in the back of JFK's head. This corroborates the fact that 2 weapons were used, with different types of ammunition. The same weapon using the same ammunition wouldn't create 4 nearly identical wounds and one vastly different sized wound.
These things in combination prove that more than one weapon and one type of ammunition were used in this shooting. It also proves that more than one shooter is responsible. The small entrance wound in the back of JFK's head proves that this shot came from the rear. The large, gaping wound in the back of JFK's head was an exit wound that came from the front. This further corroborates that there were;...At least 2 shooters,.....2 weapons used,......2 different types of ammunition used,....... shots fired from different locations,....and that at least one shot was fired from the front.............
There are many sites that show these wound sizes and locations. I apologize for the lack of references,......but these things are very easily found..