Apparently not epilepsy but similar convulsions from head injury my son and I saw years ago at a Virginia Beach skate park. A young skateboarder was doing some routine stuff when he fell smack on his head.
He was out for a little bit, and then while friends were trying to help him, started screaming and flailing and throwing the darndest fit you've ever seen. Utterly out of control. About eight guys finally subdued him just in time for the ambulance.
Scary and sad. Dunno what happened to him. He seemed so athletic before the fall and so powerful when he regained consciousness that presumably he recovered.