One of my societies had a freak accident with his split band.
I found him in the corner of the cage, hunkered down and not looking well.
When I picked him up, I saw his leg up by his beak. Seeming odd I looked more carefully. DRAT
He got the split band on his leg caught on his lower beak. So the band was holding his leg to his beak.
I have no idea how long he was in that situation, but he was not looking good.
I tried a couple tools including a plier, but could not pull the band off of his beak. So I finally tried to get the banding tool into the band to open up the band. I finally got his leg separated from his beak. whew...
But he could barely move

Probably exhausted himself, and unable to eat or drink for a long time.
So NV powder in water and a medicine dropper to get him to drink a little and rehydrate.
2 hours later and he seems to be better, standing and drinking the NV powder water, and later eating.
This is the first time that I ran into this situation.
I've seen birds pulling and biting the band, but this is the first that a bird got the band onto its beak.