I've been reading up on the different types of seizures since BR's incident on Friday. The second seizure seems to be a pretty typical Complex Partial Seizure. He could tell it was starting (called an "aura"), it didn't last long, and he had a short memory lapse during which he was unresponsive.
The first seizure, however, seems to defy classification. (Why am I not surprised.) It most closely resembles a Tonic Seizure, in which muscles stiffen. That type of seizure usually lasts less than 20 seconds. BR was rigid and screaming/moaning for longer than that. But he never convulsed, which is the sign of a Tonic-Clonic Seizure.
Searching the forums at MSWorld, seizures are not unheard of, but they are atypical. (Again, why am I not surprised.) Keppra, the new anti-seizure drug, seems to be a reasonable choice. In addition to the anti-seizure effects, back in 2003 it was shown to be effective against spasms caused by MS.