I'm just a nice guy who doesn't like hurting people. "Glass him" just seems like a weird phrase to me in general, but in retrospect I felt it should have been obvious. It was more weird just because in the moments leading up to that, everyone was just talking calmly and it felt so out of place. It makes no sense for "glass him" to mean to buy him a drink either, but that was just how my half asleep brain interpreted it, haha.