Everyone who studies the Z film. Open up a frame by frame and see for yourself.
What part of "sudden" Opisthotonos is confusing to you?
Sudden.
Not my words. This is from neurologists and pathologists.
I'm snipping your gorilla math because it's nonsense. Bullets do not throw people around like you're claiming.
Here are snippets from Alfred Oliver's testimony to the Rockefeller Commission. Oliver is a wound ballistics scientist.
"Q. What is your opinion, based upon the expertise that you have acquired in these 18 years at the Edgewood Arsenal in wound ballistics, with respect to the question of the direction from which the bullet came that struck the President in the head?
A. Well, the President in 313, the head appears to have moved slightly forward from the previous frame. Now, I say appears, because unless you measured this precisely you don't know. But it appears to have moved slightly.
And this would not be inconsistent with the momentum of the bullet being transferred to the head. Whereas I said a bullet cannot knock a person down or move a body in any violent way, it could conceivably move the head a little bit. We fired at human skulls filled with gelatin sitting on the table, and they would roll off the table. And this apparent side movement of the head is in the correct direction if the bullet came from the book depository."
...
"Now, most of the movement you see of the President moving backwards and his body moving sideward I believe is a neuromuscular reaction.
Another factor that could be involved is acceleration of the car. I have no idea of when the car started to accelerate. But at any rate, it is typical of animals or humans struck on the head to have a violent muscular reaction to it. And this is what is appears to me. Certainly the bullet didn't knock him backwards and sideways. This was, I think a neuromuscular reaction."
...
"Q. Have you ever seen an instance in which an animal body, from the impact of the bullet itself, thrust violently in the direction away from the gunner?
A. Never.
Q. Do you have an opinion, then, based upon your work in this field over the years, as to whether President Kennedy's body would have moved in the fashion that it did after the fatal shot in the head, that movement being a consequence of the impact of the bullet?
A. As a result of the momentum imparted to the body by the bullet?
Q. Yes.
A. No, it wouldn't.
Q. Are you saying --
A. The President weights a lot more than a 100 pound goat, and if a bullet wouldn't move a 100 pound goat it isn't going to move the President. This just doesn't happen."
Want more?
Duncan MacPherson, author, Bullet Penetration: Modeling the Dynamics and the Incapacitation Resulting From Wound Trauma
"Q: It is common knowledge that, as captured by Abraham Zapruder, President Kennedy's head and upper torso lurch energetically immediately following the explosion of his head. Could this movement have been caused by the directly transferred momentum of a bullet? That is, can a bullet "push" somebody like that?
A: No, and no. The movement of a body due to bullet momentum cannot be greater than the movement of the same body if it was holding the gun that fired the bullet. This is a result of elementary physics and is not disputed by anyone who understands physics. The major frustrating feature of the Kennedy assassination phenomenon is the willingness of people to pretend to talk authoritatively on subjects they know absolutely nothing about, especially things related to firearms. This body recoil is one favorite. Another is the "puff of smoke from the grassy knoll"; the theory here seems to be that someone shot Kennedy with a flintlock.
Q: If the effects observed on the Zapruder film are not the result of a direct "push" by a bullet, what could account for JFK's movements?
A: In general, body movement in response to nervous system trauma is a result of contractions in body muscles. This is related to movements of your leg when a doctor raps you on the knee with his little mallet; your leg moves because a nerve induces a muscle contraction, not because it was driven into motion by the force of the tiny rap with the mallet. The slightly peculiar location of Kennedy's arms after the 399 bullet impact is known as Thorburn's position, after a description by Dr. William Thorburn in an 1889 paper on injuries to the area of the spinal chord damaged by bullet 399. In addition to this effect, simulations have shown that bullet strikes to the skull that result in blowing out a significant hole upon exit result in skull recoil towards the bullet entry direction. The dynamics of this are a little complicated, but are more related to the pressure inside the skull cavity created by the bullet passage than to effects directly related to the bullet movement. The dynamics of this kind of impact were demonstrated independently in testing by Dr. Luis Alvarez and by Dr. John K. Lattimer et al."
