so i went to a rave with a group of friends, 7 of us total, i was the most experianced of us with rolling, since ive done it 4 times before that rave. (i know its not much, but my freinds and i are new to ecstacy, but not raving

)
i had 3 freinds who never rolled before, so they of course were my top priority.. and 3 freinds who have rolled twice before.
we all rolled the same pill, one white spade. it was by far the strongest roll ive had, and my comedown is going perfect, im not bummed out or anything, almost as if i didnt roll (btw im typing this during my comedown)
enough background tho, what i wanna know is this.. one of my friends threw up in the middle of the dancefloor (lol) and a few more times in the bathroom, but the other 6 of us didnt even feel queezy, as i said, we were all on the same pill, and we got the pills from the same dealer, so im curios as to why he was the only 1 to puke.. any ideas?