Tina Towner stopped filming about 1 second before Zapruder re-started filming. A second after Zapruder restarted filiming (around z150) the VP car and VP security car are both pointing toward the TSBD with the VP followup car somewhere on Houston approaching the intersection.
You're moving the goalposts. I don't have to defend a first shot at Z150 if I believe a first shot occurred at ca.Z157 to which people nearby reacted about Z160-Z162. A shot ca.Z160 is about 2.3 secs after Tina stopped filming.
So if that is where the first shot occurred, these witnesses are wrong:
In the VP car (4th in motorcade):
Hurchel Jacks (driver), WC 18 H 801, said "My car had just straightened up from making the left hand turn" when the first shot rang out.
SA Rufus Youngblood, WC 18 H 767, said that the VP car had turned the corner and he observed grassy area to his right before first shot was heard.
Vice-President Lyndon Johnson WC 5 H 562: said he heard the first shot "after we had proceeded a short way down Elm Street"
Lady Bird Johnson, WC 5 H 565: said "we were rounding a curve and going down a hill" when the first shot was heard.
Senator Ralph Yarborough WC 7 H 440: "as the motorcade went down the slope of Elm Street a rifle shot was heard by me".
At Z160, the VP car isn't "pointing towards the TSBD". It's pointing towards the pergola. Hurchel Jacks was "looking directly at the President's car" so how could he gauge with precision where his car was? They're probably all looking ahead to the street they're practically on; only the trunk area is still on Houston. The car is no longer "rounding a curve" if it has literally "straightened up".
Occupants of the VP follow-up car (5th in motorcade) described the moment of the first shot:
Joe Rich. (driver), WC 18 H 800: "I was staying right on his bumper" (of the VP car). "we turned off Houston Street onto Elm Street"
Clifton Carter, WC 7 H 474: "our car had just made the lefthand turn off Houston onto Elm Street and
was right along side of the Texas School Book Depository Building"
SA Kivett, WC 8 H 778: "The motorcade was heading slightly downhill toward an underpass. As the
motorcade was approximately 1/3 of the way to the underpass.."
SA Johns, WC 18 H 764: "at this time were were on a slight downhill curve to the right"
SA Taylor, (18 H 782): "our automobile had just turned a corner"
If the VP follow-up car was "right along side the Texas School Book Depository" (Carter) at the moment of the first shot, how can the VP car still be "rounding a curve?" BTW, Carter was interviewed in May 1964 and might have based his car's position on seeing the Altgens photo.
What does "1/3 of the way to the underpass" mean? Relative to the Curry car or X-100? Does Kivett's perspective influence the size of the 1/3's he's sizing up?
Occupants of Mayor Cabell’s car (6th in motorcade) recalled hearing the first shot as follows:
Milton Wright (driver), WC18 H 802: "had just turned onto Elm Street and approximately 30 feet from the intersection"
Earle Cabell, WC 7 H 479, said that he was turned around talking to Rep. Roberts and Mrs. Cabell with the TSBD situated to his back.
Mrs. Cabell, WC 7 H 486, "we were making the turn" ... "I was directly facing [the TSBD]"
I believe Wright was a two-shot witness, so his position might apply to the second shot. Wright would not be pass the curve for a Z191 first shot. The car Mrs. Cabell was in was facing the Depository at Z160 and was turned about 40° off Houston. I imagine Mr. Cabell turned towards Roberts would have his head turned away from the Depository.
In addition, there were at least 20 witnesses who said that JFK reacted to the first shot in a distinct manner that is quite inconsistent with smiling and waving for 2-3 seconds.
How many of those actually could see the front of the President? Mary Woodward could see the front of Kennedy and was near to him; she said he was uninjured by the first shot and that he looked around, and stumped only on the second.
In addition, you have Hughes, Betzner and Willis and several witnesses along Elm who put the President much farther along Elm than he was at z150.
You're claiming Hughes writing "About five seconds after I quit taking pictures we heard the shots" supports a first shot in the Z190s? Hughes stopped filming six frames before Z191 or 1/3 sec. Betzner is not looking down and winding his camera during the Z190s; he might be by Z223. Willis testified the first shot occurred between him talking his 04 slide (Z137) and 05 slide (Z202), noting Mrs. Kennedy turned her head from his side of the street to the opposite (she does this beginning about Z172).
Trask interviewed Croft and wrote a whole chapter about him. While he also uncovered an FBI document of an interview with Croft and uses a quote from that, it is inconceivable that Trask would not have confirmed with Croft those details when, for example at p.225 Trask, says that Croft quickly wound his camera as the car went by and took his fourth photo as he heard a shot. The bottom line is that Trask confirms that Croft took his z162 photo a perceptible amount of time before any shot was heard.
The sole footnote for that is an FBI AirTel.
You are assuming that Myers gave a complete quote from Gary Mack's email. It is apparent that he omitted the reference that Mack would have given to the 1996 oral history statement.
You are assuming that Myers had something he needed to omit. He's not a defense attorney. Could be Mack talked to Towner in the interval between your email and Myers.
We need to determine why she has given a range of 1 to 6 seconds as the delay between her end of filming and the first shot.
And you have no stake in it. LOL. You've mischaracterized dozens of witnesses.
Her recollection that she was getting ready to leave when she heard the first shot suggests that the delay was closer to 6 seconds than to 1. Four seconds would put the first shot at about z191.
Tina said "Now I was beginning to leave when I heard the sky fall in" in Teen Magazine. The Kennedys had gone out of sight and that was basically all she was there for. Don't think she was enamored with Lyndon Johnson. When she stops filming, the next thought is of leaving. Any objective tally of her reported estimates would lean towards the area of two seconds.