It wasn't my snake, it was a snake I brought home from the sanctuary that I wanted to try to get it to eat since it wouldn't take anything offered.
I believe I didn't zip the whole bag up, I did leave some space for airflow since I thought about the whole suffocating thing, which would have been horrible. I can only stand freezing snakes instead of suffocating or banging on the head with something heavy really hard (I could NEVER do that)
He was twisting his body around too, so I assume it was IBD. We had a couple snakes from the Texas seizure have IBD so I think they could have passed it on to some of the Burms, although this is the only one I've seen showing signs.
I was always told the best way to euthanize is to freeze it, so that's what I did. I couldn't ever do the other ways, and I wouldn't go to the vet for a shot to get it euthanized since it's pretty expensive and this snake isn't mine. He was very limp when I took him out as well, so I assume he was just about dead.