As the woman on Hillary's left side lifts her up by her left arm, her right arm goes further behind her back.
As the man comes up on her right side and pulls her along by her right arm, the restrain on her wrists breaks and can be seen dangling from her right wrist as her arm sweeps to the right from behind her back. That is the aproximate moment we hear and see something metalic dropping on the sidewalk.
Not only is she in ill health, she is collapsing in fear.
Hey, my surmise is as good as yours, right?