I've been on a ship with Mike to witness a seizure, and he can be quite entertaining. JUST KIDDING JUST KIDDING!
I do hate that there's any stigma towards people suffering from epilepsy.
I'm betting the mother knew quite well what to expect when it happened, how to react, etc. from experience.
Sounds as if Thomson just panicked,and did nothing to listen, or check what might happen even if it occurred again during the trip.