Ive been looking at the photos and videos (with sound) and I think what probably happened is the following:
1. Hillary feels a convulsion/seizure coming on (Parkinsons) and turns to her doctor, Dr. Lisa Bardack, who is by her side.
2. The doctor immediately takes out an injector pen (Apokyn pen) to inject her with apomorphine, an immediate-acting dopamine agonist, so that she will not lose motor function or at least will quickly recover it while she is out in view of the public.
3. The doctor has to replace the empty glass cartridge from the injector pen with a new cartridge to inject her, and the doctor has the empty cartridge in her hand.
All this happens while Hillary is still in the crowd, before the video of her being loaded into the van.
4. As the van pulls up the doctor drops the empty glass cartridge on the ground near her foot, and then tries to kick it away from the group with her foot. As it turns out, she hits Hillary in the back of the cankle with it, which fuels speculation that the object fell out of her pant leg and was mistaken for metal but in fact was primarily a glass object.
5. In the event, the medicine does not work quickly enough to prevent Hillary from losing motor control and we see her crew drag her motionless feet on the ground and toss her into the van.
Its too bad some bystander did not notice the object on the ground afterward. Hillary and her doc would have been outed for her Parkinsons disease.
has that been established somewhere?