Has anyone posted the evidence that when the Zapruder film frames are analyzed particularly focusing on the presidential follow- up car occupants.
Certain agents can be seen as early as the starting frame z-133 and all of them eventually become visible by frame z-153.
The point is if you look only at these agents, particularly LANDIS, C HILL, READY and HICKEY, (also MCITYRE) they do not turn to look to the rear in any frame they are visible in, they are all visible until Z-207, HICKEY can still be seen in Z-212 looking forward.
Also of note: Even after the first 'firecracker' like noise occurs MCINTYRE does not show any reaction.
About frame Z-200 READY, LANDIS, HICKEY and HILL turn their attention toward the grassy knoll, this is just following frames Z-190's where JFK appears to stop waving.
Side note: if you watch HILL, he never turns and only watches the limo and also seems to have a brief discussion with someone in the follow up car before he moves to the limo.
This evidence should indicate that the first shot was around Z-190 and that the first reaction of the agents that heard this shot was to peer towards the source of the sound which was the grassy knoll.
I have animated gifs, if you care to see.
Bob Mady