I’ve looked at some more of the Z-film frame by frame using the Costella edit which includes the area between the sprockets, and I’ve discovered that at Z212 2 SS agents beside and across from Clint Hill are still visible and they are looking forward.
Up to Z230, the SS agent behind Clint Hill is visible and at Z230 this agent is still looking forward.
The Willis girl has stopped and looks back by Z205 but 2 SS agents at Z212 haven’t turned their heads back and up to Z230, the SS agent next to Clint Hill had not turned his head back to look at TSBD.
Should there not have been some Clint Hill reaction from Z190-Z230 even if he was tasked with keeping his eyes focused on JFK?
So it seems to be a discrepancy in reaction time by the SS agents up to at least Z230 versus the more immediate reaction of the Willis girl stopping running by Z200.
Plausible reasons for this apparent discrepancy of reaction times between the SS agents and the Willis girl?
1. The SS agents were hung over from the Thursday night party and their nervous systems and senses were depressed?
2. The SS agents were desensitized by having heard occasional random motorcycle backfires occurring over the duration of the limo trip from the point of origin to entering Dealey plaza?
3. The Willis girl was reacting to something else other than a gunshot such as a motorcycle backfire?