Watching her stiff movement then inability to control her body at all says STROKE to me. The devil always takes his toll when you make a deal with him. It will include Chelsea if not her children as well. Her husband is already MIA since the first month of marriage.
I just watched that video 10x zooming in on the people around her. The female agent by the front right of the van - she glanced over her shoulder at Hillary and knew something major was going on. There is a guy mid video behind the tree in a darker gray suit with a phone - I think that is Robby Mook, the campaign manager. Behind him is a tall agent walking toward the second vehicle. He opens the front passenger door to get in, sees what is happening, and walks back toward the van, reaching into his inside pocket as if he also has a injection device.
I believe she was already experiencing a seizure when the video started. The nurse or doctor had a firm grasp of her arm. Hillary’s head never turned as the van approached, nor did she begin to step towards it as it arrived. Zooming in on her feet, she is dragged over the curb, you can see the soles of her shoes, with the toes dragging.
I’m not buying pneumonia as a plausible excuse. It is either a seizure or a stroke. Either way, she definitely over rode whatever sound medical advice was given her in order to maintain her facade.