My point is that Hinrichs has avoided the prior frames that show Kennedy already reacting.
No. It proves that Hinrichs avoided prior frames that show Kennedy reacting to an exterior stimuli earlier than he (Hinrichs) is claiming.
Which prior frames?
Just because you think they "show Kennedy reacting to an exterior stimuli" doesn't mean that he was -- or that Hinrichs "avoided" anything.
I get it. Hinrichs is assuming JFK was shot through the neck after which he was shot in the back. Instead of a through-and-through shot he thinks there's a bullet still in his neck and a bullet stuck in his back. None of which turned up in the autopsy. Painful