Our memories can be faulty. However, we tend to remember things by association.
Right. Like Croft, Betzner and Hughes remembering that their film exposures occurred BEFORE the first shot.
And when multiple people’s memories agree about the timing, they tend to corroborate each other. In my opinion, the accounts of Tina Towner, Victoria Adams, Howard Brenner, Amos Euins, and some others point to the first shot occurring just before the Zapruder film segment begins.
Charles, you are simply confirming your own bias. All Victoria Adams said in her first statement was that she heard 3 shots when the motorcade was passing. She said her view was obstructed at the time and in her WC testimony she said her view of the President's car was obstructed by a tree at the time of the first shot. Since she said she was looking out one of the two windows in the third set of windows from the east side* this means that the oak tree (the only possible obstruction) was between the third set of windows from the east corner (4th floor) and the President's car. In other words, it was some distance along Elm St., not anywhere close to z133:
*Dorothy Garner confirms this: "I know this window to be the fifth window from the east end of the building. I recall that Mrs. Elsie Dorman was sitting next to me at that time looking out the sixth window and that Victoria Adams and Sandra Styles were both standing next to Mrs. Dorman and myself looking out the fifth and sixth windows".
The actions of the limo occupants, and some others immediately after the Zapruder film segment begins appears to show them looking around after being surprised by a loud noise.
Fine. That is what Secret Service agents are supposed to do normally. So that means absolutely nothing. But they are all consistent in saying that the first shot occurred when 1. the VP car had just finished the turn (it is still turning when last seen at z180). 2. the VP security car was about to finish the turn (it is pointing north at z180):
As far as JFK, Jacqueline and JBC looking, that fits precisely with what Mary Woodward said: she said they shouted and JFK and Jackie turned toward them and the President waved. She said they were the last people that the President acknowledged before the first "horrible ear-shattering noise".