There’s a more obvious clue that you have missed. Watch the video again and note carefully the position of each Secret Service agent.
You will see the one they call the “Bald Agent” (who I have read is the shift leader) move ahead of where Hillary is leaning against the bollard, cross over in front of her so he is on her right side, and then he and the other two help/throw her into the van when she collapses.
The interesting thing is that he KNEW to cross over and be on the other side. Why? I say it’s because this has happened so many times before they expect her to collapse and he wanted to be in position to support her. It seems pretty clear that if he hadn’t, she would have gone clear down (again, watch the video but focus on the position of her blond head, it drops to a level below that of the seats in the van despite the assistance she is getting).
THe SS is probably following orders from the Clintons and the campaign, but those orders make them complicit in the coverup.
And what have we learned about cover-ups?
Cover-ups eventually become uncovered.
And note that we don’t see her head -above- a certain level either.
I wonder why the video didn’t run longer, to when they closed the van doors?