So, you are conceding that since the HSCA concluded that the shot that struck JFK in the back was at z190, the HSCA did not state that the reactions of either JFK or JBC at and after z226 were neuromuscular reactions, right?
The main reasons the HSCA mistakenly "concluded" that Oswald's second shot was at Z-190 instead of at the Warren Commission's Z-210 to Z-225 were because the late-arriving so-called acoustical "evidence" totally fooled it, because it mistakenly believed that Zapruder had filmed the whole assassination, and because it didn't realize that Oswald's first shot was very early and missed everything.
The reason the HSCA didn't think JFK's reaction to being hit was neuromuscular in nature was because it mistakenly believed he had been hit at Z-190, two seconds before the much more realistic Z-222, Z-223, Z-224, or Z-225.
ME: Why did the HSCA conclude that JFK was hit in the upper-back / lower-neck at approximately Z-190 instead of around Z-225?Perplexity AI: Because the HSCA’s acoustic reconstruction placed the relevant shot near Z-190 and required enough time before the fatal Z-312 shot for Oswald’s bolt-action rifle—tested at a minimum average interval of 2.3 seconds—to fire both shots. A later first-hit frame would compress the interval too much.
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LOL!
PS The only thing I concede is that, IMHO, you're a total jerk.