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.
“Back and to the left...”
Do you shoot?
I shoot...alot...