The Z-film alone gives us clues as to when the first shot was fired without using any witnesses. We see JBC turn to look over his right shoulder at Z164. Here's where a CORROBORARED witness can come into play. He said he turned in response to hearing the first shot which he recognized as the sound of a high powered rifle. The film and JBC's statement jibe. Without JBC's statement it would be hard to determine that his turn to look over his right shoulder was a reaction to the first shot. The fact the film and his statement jibe strengthens the probative value of both. In addition we have Rosemary Willis running alongside the limo. She begins to slowdown during the Z160s and when she comes to a stop, she turns and looks back to the TSBD. She later said she did that upon hearing a gunshot. She didn't testify before the WC but was called by the HSCA. None of this is proof positive as to when the first shot was fired but taken as a whole, it is probative of a shot prior to Z164. If we add to that the blurring and frame jump in Z155, it is a strong indication of a shot around Z147-148.
If we don't read the reactions of JBC and Willis as evidence of a gunshot, there is nothing in the Z-film that would tell us when Oswald's missed shot was fired. That is why the WC never determined which shot missed. They allowed that it could be the first, second, or third shot.
Once again, you talk out of two sides of your mouth.
There is no sound on any film. You are backing into your a preset conclusion with no basis of fact.
You said witnesses cannot be relied on and are often times wrong. How do you know JBC was correct about when he turned?
He disputed the SBT directly. You cherry pick what you want.
Phil Willis took his number 5 picture when he heard a shot. That was about Z-frame 202.
Hugh Betzner took his number 3 picture and was winding his camera when he heard the same shot.
Sam Holland, was on the bridge. He heard the same shot when JFK reached for his brow. That occurs about Z-204.
Look at Betzner 3 and Willis 5 - see where the car is between two pictures. WC wouldn't. Look at "Black Dog Man" in both pictures.
A human figure taken with 2 different cameras - both oddly without any flesh tone or distinct characteristics. (
a black man huh?)
Rosemary told the HSCA:
Ms. Willis stated that she was present with her father and a sister in the area of the grass section of the plaza at
the time of the Presidential motorcade on November 22, 1963. The other was a person who was standing just behind the
concrete wall near the triple underpass. "That person appeared to "disappear the next instant." How do you know when Rosemary Willis stopped and why? - She ran ahead of the limo - how do you know she
wasn't looking back for the car. Her father told Shaw Trial he called her name - How do you know she didn't turn for that ?
She stopped for a shot. - When was the shot? You don't know. Witnesses are often wrong (
but only when you want).

Your time line isn't proof of anything
Interesting, she actually stops short right around z- frame 200.