Altgens 8 captures the moment Zapruder and Sitzman have just got off the pedestal and are walking away from it.
The Hesters are seen on the grass.
Why can't Zapruder and Sitzman be seen walking away in Weigman?
Look again at the synchronisation JFK Theorist did of the Zaspruder and Weigman footage. Also, look at the synchronisation I did between these two films earlier in this thread which closely parallels the work done by JFK Theorist. You will notice that as Weigman runs towards the Hesters the Zapruder film is still running meaning Zapruder is still filming meaning that Zapruder and Sitzman are still on the pedestal as Weigman runs towards the Hesters.
That's why you can't see them walking away in Weigman.
As Weigman reaches the spot where he starts filming the Hesters, Zapruder and Sitzman get down from the pedestal.
Altgens8 is taken at the same moment. It is taken a brief moment before Weigmam has the Hesters centred and stable in his footage. Mr Hester immediately gets up and runs into the pergola.
On a good copy of the Wiegman Film, (good being relative to the early Wiegman Film Copies), you can see the Pedestal, the Top of the Pedestal, and the concrete that we see Zapruder and Sitzman walking atop on Altgens 8. There is No Zapruder & No Sitzman in any of these areas on the Wiegman Film. Same goes for the Empty Shelter behind the pedestal. Zapruder and Sitzman are not on these Wiegman Film frames that show these areas. There's a couple of these frames when Wiegman was still physically on Elm St, and 2-3 good frames when Wiegman had physically moved onto the Knoll. This is before Wiegman filmed the Hesters. One of the guys that was wearing a shirt/jacket with the white trim that encircled the shoulder, is also filmed on the knoll. I believe this is 1 of the 2 guys we see on the Bell Film near/inside the shelter behind the Bench. (Time Stamp). The absence of Zapruder and Sitzman on these Wiegman Frames calls the current timeline assigned to the Wiegman Film into question. The same goes for the Bell Film timeline being Wrong. The Bell Film shows 2 guys wearing shirts with the shoulder trim inside the shelter behind the Bench.
During the Josiah Thompson interview of Sitzman for "Six Seconds In Dallas", Sitzman said that the 1st thing she did after getting down from the Pedestal was to go down to the bottom of the Knoll to see what was going on. (paraphrasing). She said she talked with who she thought was a SS Agent down there. She then returned to the top of the knoll. Maybe Sitzman being at the bottom, or in the process of reaching the bottom of the Knoll, explains her absence from the Wiegman Film? Zapruder's absence? I don't know.