Woman is sick. And I do not say that to mock her. But she is ill....
If a person was feeling faint due to hyperthermia her arm would be limp. It wasn't. It was stiffly bent at an odd angle.
The thing that looks scariest to me in that video is the moment before she stumbles, not the stumbling itself. She is propped up against the cement pole as stiff as a piece of wood. The woman seems to be there to keep her from falling sideways off the pole, not to keep her up. They calmly wait to move her for a few seconds until the two largest men are at her arms and can carry her, but they don’t seem to be afraid that she will collapse at the pole, because if they were, the two biggest men would already be at her side holding her up. They seem to understand she is just a petrified slab propped up against the pole.
I saw exactly what you did. She was having a seizure. I’ve worked in hospitals and nursing homes and have seen people having seizures many times. In such moments the human body can freeze up as solid as steel. My wife is a CNA(certified nurses aide) and has worked with patients who suffer from every aliment you can think of. She said, based on what she saw in the video, that Hillary has all the signs of Parkinsons.