This is a simple question that deserves a reasonable response. But instead, we see an unreasonable relentless attack on Joe. This is why I believe it best to ignore responses from these attackers. Once in a while I get a wild hair and disregard my own suggestion. But I tend to ignore them the vast majority of the time.
Joe, in my opinion and to the best of my memory, not one eyewitness reported what you are asking about. And I believe that one primary reason for this is that the forward movement was only a short distance and the small fraction of a second that elapsed was too quick for discernment by normal eyesight. Zapruder had an almost perfect angle for detecting the forward movement. But practically everyone who views the Zapruder film at normal motion speed misses the forward motion and only perceives the much slower backward motion that followed. Only a handful of the eyewitnesses in Dealey Plaza had a similar angle to Zapruder’s angle. I think that those witnesses would be the likely ones to search for any possible reports of what you are asking about. The other eyewitnesses, with views from other angles, I think would be even less likely to be able to detect such a small and very quick forward motion.
I think you have good advice. In the future, I will try to ignore responses that seem designed to dodge the question, like bringing up unrelated posts from months ago, and just look for answers.
And to clarify, naturally none of the witnesses at Dealey Plaza noticed the 1/18 th of a second forward head movement of two inches between z312-z313. But the movement I was asking about was the backwards motion from z313-z318 of about ten inches (as I recall). It seems that none of the Dealey Plaza witnesses noticed this at the time. So, it seems reasonable that Dan Rather would also not notice this from his one time viewing of the Zapruder film. Despite what others said, I don't think Dan Rather 'knew' ahead of time exactly what he was going to see in the film and, like the Dealey Plaza witnesses, was so shocked by the head explosion that he did not notice or remember the slow (maximum speed of just under 2 mph) motion of the head and torso backwards during z313-z318.
And on another note, some might claim that Dan Rather did see the brief forward motion of 312-312 of two inches. I don't think that would be possible from a one=time, real time, viewing of the Zapruder film. Certainly highly implausible. It was likely the subconscious of Dan Rather figuring out what he should have seen, not what he actually saw. A common sort of error that people make from a one time viewing of an event, whether in person or on film.