Obviously, without all of the details, it could have been a very serious medical issue, but if it was a seizure (not trying to minimize), there is little to be done. I say that in regard to KT basically claiming it is was a miracle of life that she was there. Oh, and so was a doctor (who had the situation under control), I am sure.
You basically turn the person on their side and watch the airway, keep the person safe by removing dangerous things nearby, give space, and wait for EMS to arrive. I was in military medicine for 20 years, EMT, trauma, etc., for perspective so I don't sound like an uncaring dick.