The first-aid reportedly given to White Sox player Greg Walker during a seizure (before a July 30 game against the Angels) was improper.
There is no danger for a person who is having a seizure of swallowing his tongue. There is danger, as was evident in the report of Walker's tooth being chipped, when a hard object is put in the person's mouth.
Also, the person should not be held down during a seizure. The area around the person should be cleared and, if possible, he should be turned onto his side to help keep his airway clear.