Question: What caused the "radical reaction" by JBC at the same moment as JFK's "radical reaction" to a bullet hitting him?
Hearing the first shot. His reaction described in his WC testimony fits exactly what we see him do after z228. I have updated my earlier post to elaborate.
Here is what JBC said (4H132-133):
- "We had just made the turn, well, when I heard what I thought was a shot.
I heard this noise which I immediately took to be a rifle shot. I instinctively
turned to my right because the sound appeared to come from over my right
shoulder, so I turned to look back over my right shoulder, and I saw nothing
unusual except, just people in the crowd, but I did not catch the President in
the corner of my eye, and I was interested, because once I heard the shot
in my own mind I identified it as a rifle shot, and I immediately-the only thought
that crossed my mind was that this is an assassination attempt.
So I looked, failing to see him. I was turning to look back over my left shoulder
into the back seat, but I never got that far in my turn.
There is absolutely nowhere in the zfilm prior to z250 where we see any attempt by JBC to look over his right shoulder to check on JFK. None. Before JFK is seen reacting, JBC does not even turn his neck past 45 degrees forward relative to his shoulders.
Don't we also see a physical reaction by JBC as the bullet hits him in the right shoulder like, as he said, a "fist"? If that wasn't a bullet then what caused it? I'm sure you answered this before but I can't find it offhand.
I can't tell from just the film what he is reacting to. We have to follow the evidence and fit it to what is seen in the film. He said he turned "to look back over my right shoulder" and he does not begin preparing to do that until about z228 and he does not look "back over my right shoulder" until about z255. We can see him straining to look back in Altgens #6 at that time. We know from SA George Hickey that Hickey was turned forward watching JFK at the time of the second and third shots. Hickey is still turned rearward in Altgens #6 at z255. So, according to Hickey, the last two shots are after z255. That fits with what 80% of those who recalled a pattern to the shot sounds said.
So, in answer to your question, what hit him (other than, possibly, CE399 striking his left thigh) was the realization that the President was being assassinated. That is why he yelled "oh, no, no", as Nellie recalled, after the first and before the second shot. We can see him uttering something that looks very much like "oh, no, no" in the z240s.