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This is the third occurance of movement and undeniably related to gunfire. At the moment of impact, JFK is leaning to his left. As the bullet strikes, his head is driven forward before it begins a backward recoil. Governor Connally is down in the arms of his wife at the time of the head shot. As the bullet strikes, both Connally and his wife roll down and away from the line of fire.
In the 1/18th of a second interval between Zapruder frames 312-313, JFK's head is driven forward by the impact of the bullet. During this same interval his head moves to the left. This may be due to the expulsion of debris from the right-top front of his head.