Sure, and his head, as well, brain matter flying backwards proves he was shot from behind...
I once saw an “expert” explain, in connection with that, that it is only from watching TV dramas that we think that when someone is shot that the body follows the direction of the bullets. He claimed that in every instance the body lurches against the direction of the bullet. I kid you not.
Except the brain matter didn’t fly backwards. The Zapruder film clearly shows an explosive eruption of the president’s head with spray flying in all directions. Much of it was forward, not backwards. There was blood and tissue all over the front of the car, inside the windshield and even on the hood. The head also moves forward briefly before being driven backward per either the jet effect or a muscular spasm, or both.