The problem for you with that "take" is that Prayer Person is visible in situ in Weigman, and Weigman started filming the steps just before the first shot rang out.
-- MWT
Minor correction Tommy.
Wiegman reacted sometime
after the first shot, close to but also after Altgens' own first reaction(which is what I believe it is, I mean, Ike taking a picture of the motorcade without Kennedy fully visible would be worthless). Wiegman is seen on Houston expecting something to happen and ready to react to it(Skaggs) and did not have the limo or QM in his sights yet those few seconds later, so his reaction was more likely IMHO based on what he heard, a loud crack perhaps.
The filming of the entrance, pure coincidence as he got ready to jump out, again IMO.
Folks moving around the steps inbetween shots, in reaction to them? Not impossible of course but the only evidence of that is from Lovelady and who really knows why he moved exactly? He was even moving around before it all really began.
So BWF not only heard recognisable gunfire but he notices others next to him react to it and then he gets confirmation some twenty seconds later that JFK was actually hit he's genuinly stumped? Just how big is this hole he's digging for himself going to get?
First question to him about shoes should be regarding whether he knew how to tie them. It's not looking too good.