Hillary Clinton goes into a seizure and convulsions during interview, then appears to try to play it off as a joke afterward. It is possible she has some sort of illness, or thinks it is funny to mock people with seizures.
This does not look like a common seizure, unless seizures are so common to her that she already knows how to control it. It is strange, but the lady behind her is even more strange, she keeps looking at the journalists, she glances at Hillary but shows no surprise at all, nor try to help. It is almost as if she is part of it.
The expression of one reporter seems to be pure fear: