She could just have had knees.
Carrying the weight she does would cause that.
Before the first misstep, she goes down the steps in normal left-right sequence. After that first fall, OTOH, she leads with her left foot each time, including after the second fall. Funny thing is, you lead with your weak knee going down steps (and with your good knee going up) and yet. if anything you’d think that both falls might have weakened the right knee, not the left. Interesting.But as to the reason for Hillary’s missteps, Dr. Noel points out that Parkinson’s sufferers typically have difficulty identifying the landing point for their foot. He showed a picture of a cane which uses a laser to draw a line on the floor as an aid. And he showed a photo of Hillary walking beside a Secret Service agent who is holding a flashlight to illuminate the spot where she will step.
Could it be... SATAN?