She?
I thought we were talking about Betzner.
My bad.
I was talking about both and got confused between this and the First Shot thread. But the point is the same. The idea that anyone would have forgotten about the first shot is absurd. They may not have counted all the shots but the idea that they did not notice the shots is something that you are just speculating about to explain why not a single witness put the first shot anywhere near where you put it (half a second before Zapruder started filming).
Tina Towner put it later (4-6 seconds after she stopped filming according to her 1996 oral history at Sixth Floor Museum). Hugh Betzner put it later (after z186). Robert Croft put it later (after z161). Occupants of the VP car put it later (just completed the turn). Connally put it later (150-200 feet after the corner). Mary Woodward put it later (after JFK's last right turn, wave after he passed by where she stood). Occupants of the VP Security car put it later (almost completed the turn). Greer put it later (when they were passing the west edge of the TSBD). Billy Clay, Jean Newman, Georgia Hendrix, Sue Dickerson, Peggy Hawkins, said the President had just passed them when the first shot occurred. Karan Hicks said :The car he was in was almost directly in front of where I was standing when I heard the first explosion."
How could all these witnesses independently recall a first shot 4-5 seconds later than you suggest and all be so wrong and yet not a single witness put it anywhere near where you suggest?