Actually, there were over 60 bullets fired from four different positions, and through a combination of JFK's powers as The One manifesting outside the Matrix stopping the bullets coming from the front by a grassy Ghillie suit wearing Noel Gallagher of Oasis standing behind the Wonderwall, Magneto using his magnetokinesis to deflect bullets from the side fired by Abraham Zapruder whose body had been possessed by a Quantum Leaping Oliver Stone trying to preserve the assassination and guarantee his fame as a filmmaker, and Daenerys Targaryen's dragons incinerating the sixth floor of the Book Depository Building with Patsy Cline in it with an old Italian bolt-action rifle, having faked her death in a plane crash months before so she could operate as a freelance assassin hired by both Castro and the CIA, most of the bullets were stopped.
Unfortunately, Scaramanga's tiny henchman Nick-Nack had been hiding inside the glove box of the limo the whole time and wounded Gov. Connally and fatally shot JFK with a single magic bullet from the Golden Gun. So the shot was coming from inside the car the whole time!
It's almost too plausible.