His head does NOT snap backwards at the moment of the impact- as you can clearly see in Fivers' posted gif of the frames before and after impact.That was just one of the things. Which sadly became a main part of the conclusion for some. Other evidence, such as the various statements by medical professional witnesses was more important.
And the debunking was more an expression of opinion by FBI, not actual evidence AFAIK.
His head snaps backwards. Here is a stabilized version of the film.A version of the jittery original is here:, check starting at the 0:50 mark.
Clearly the head snaps back after impact of the bullet.
The head snapping back has been explained in 3 ways:
- bullet from the back + neuromuscular reaction [debunked, it is neither of the two possible reactions: “decorticate” or “decerebrate” ]
- bullet from the back + jet effect, a later theory [also debunked, calculations miss the initial impact, i.e. the majority of energy is at initial impact and should fling head violently forward, if hit from the back, not backward]
- bullet from the front
More on that, for example, here: Kennedys And King - NOVA’s Cold Case: JFK - the Junk Science Behind PBS’s Recent Foray into the Crime of the Century
That was the base view, this is the other view:
That is too little damage. Looks rather pristine to me, this bullet is supposed to have bounced against several bones & fractured them. Even if the seating was such that it did not need to zig-zag, then it still fractures many bones.
And for example the back-wound of the governor was too large (3 cm) for an entry wound, unless the bullet was already shredded into shrapnel, which it apparently wasn't ... how does that work?
Ergo the logical suspicion was that this is not the actual bullet, but somebody decided to 'help' the investigation by putting this one on a gurney in the hospital...
After about a fifth of kennedy's brain is ejected from the front of his skull by a bullet that passed THRU his skull- his head recoils backwards but takes 5 frame to get back where it was. This is the result of two forces acting on Kennedy's head- one the ejection of that much mass out of his head is like a rocket nozzle- it has a reaction. and secondly, his back muscles spasmed from the nervous system shock of the bullet passing thru his brain.
As to YOUR opinion of the bullet being Too pristine- that't just because you are ignorant.
In one test of the single bullet theory, they took an identical rifle, firing an identical round and shot the bullet into the end of a LOG. They then split the log open to extract the bullet- it had penetrated 3 feet into solid wood and came out looking about the same as the bullet they recovered from the assassination, except it wasn't flattened laterally because, unlike the oswald bullet... it didn't hit anything sideways.
The bullet started to tumble as it entered kennedy's upper back- in further testing it was found that the carcano rounds always tumble upon impact with soft tissue. Which explains the wide exit wound in kennedy's neck and the wide hole in connally's back. the bullet stopped when it hit the heaviest part of connally's radius sideways, fracturing it.
once more... numerous tests conducted over time have proven that the bullet was NOT magic- it flew in a straight line- and all the holes in the passengers and car line up with a straight line centered on the snipers nest window. the cullet was more than capable of making all those wounds and coming out looking exactly as it did, not pristine, but damaged at the tip, and flattened by a force so hard that it squeezed solid lead out the bottom of the bullet like toothpaste.
'Stop believing horse pucky.