Seizures

who's heard anything about people having seizuers from smoking weed? a couple weeks ago my bros and i were all toking, when one of my buddies says he felt 'really really high' and went for some air. it didn't work and he started stumbling around and then started to mad twitch out and shit, he then fainted and landed on a table. after reviving 10 seconds later, he was like 'what the fuck just happened' and was still out of it. then his eyes rolled back and his arms and shoulders just started twitching and spasming for a bit and we had to prop him up. then he stood himself up and the color just drained out of his face. he went pale white and still couldn't stand properly. we gave him some water and let him sit it out.

is this normal? bud wasn't laced because we were all fine and i'm trying to remember if alcohol was involved... but either way, what the fuck happened? this wasn't just a pass-out, this was a spasm attack, scary shit.

just trying to look out for my holmes, anyone got any advice?