What is your evidence that a reflex reaction takes 440 ms. (8 x 55 ms) to move from the z224 position to the position in z232? Keep in mind that the hand doesn't move that much - rather his left elbow rises and his torso slides down and forward. In any event, that is plenty of time for the elbow to lift and the hand to change position slightly, let alone for the torso to drop a few inches.
Do you have evidence that increase in pressure over six inch long section of nerves in the brachial plexus can do this? How much pressure? Do you even have any evidence of the amount of pressure applied to those nerves during the passage of the bullet through the upper torso? Do you have evidence as to how long such pressure must be applied before there is a response?
That is why this is not evidence. It is just a theoretical possibility without supporting evidence from which anyone could conclude that it could happen, let alone that it did.
What evidence is there that nerves were struck or damaged in JFK due to the passage of the back/neck bullet?
There's no point having this conversation. You deliberately "misunderstand" my point as it is yet another nail in the coffin of your own pet theory (which is now more nail than coffin).
Just to clarify for those who may read this thread and who don't already have an entrenched position/agenda that needs defending -
Take a minute to examine this picture:

Look at how extreme the posture is, how both elbows are extended to, what appears to be, their fullest extent. In the Z-film, the upper part of JFK's body noticeably stiffens for a moment as his arms shoot up. There are very few who would argue against this extreme movement/posture being a reaction to the throat shot.
The point being made is that 0.44 seconds before this image [not 0.33, as I incorrectly posted] JFK's left arm is down by his side:

What can explain, not just the incredible rapidity of the movement of his left arm from down by his side, but the extreme posture of his fully extended elbows?
The most coherent explanation is that this is a reflex reaction to being shot through the throat. But how would this explain the radical movement of the arms? This is explained by Artwohl and Strully:
“JFK’s reaction to the neck wound was, for all intents and purposes, instantaneous to the hit at Z-223/224. As the bullet passed through his neck, the pressure cavity caused an immediate and wide spread stimulation of all the nerves in the immediate vicinity, that is of the brachial plexus, the large group of nerves that emerge from C5-T1. These are the nerves that supply motor function to the arms.”
"Before all else, it is necessary to remember that this assassination reveals a sequence of neural responses initiated in the neck by the shock wave and cavitation induced by the bullet in its traverse of the neck. This traumatized all structures in a 6 inch radius in all directions from the path of passage through the neck. This spread of forces occurred in a fraction of a second, traumatizing all neural structures in the immediate vicinity within a fraction of a second as determined by the speed of the missile according to ballistic studies.
As a result, contraction of the muscles innervated by nerves closest to the bullet's path took place first; -- right deltoid, left deltoid, right biceps followed by the left biceps and sequential contraction of all muscles in the forearms, hands, chest, abdominal walls and paraspinal muscle groups, with muscles in the lower extremities, farthest from the shock wave, responding last. All neural structures in the neck were stimulated at the same moment…”
It is no coincidence that the bullet passes through the Brachial Plexus, the nerves that supply motor function to the arms. To imagine the extremely rapid movement and radical posture of JFK's arms is caused by anything other than damage to the nerves of the Brachial Plexus seems unlikely, to say the least.

As far as Andrew's theory is concerned - a first shot at z195. As shown elsewhere in this thread, the first recorded reaction of JFK to being shot is z225, this accords perfectly with an "instantaneous" reflex reaction to a bullet passing through the Brachial Plexus at z223. However, a shot at z195 would require JFK to "wait" for more than one and a half seconds before the radical reaction we see recorded in the Z-film. This is an eternity in terms of reaction times to being shot and does not explain the extreme posture of JFK's extended elbows.