WOW thank you for sharing! So it seems like only the left side of the jaw is broken? Maybe suggesting that the weight of his body was on the right side.Like if he bit the link with bottom mandible inside the link opening, sitting on the swing, got stuck, panicked and fell hanging from his lower beak hanging sideways? Could explain the injury .....
it's his right side that is broken. I think somehow some way he got his beak caught in those links.
either from the pear loop hook, or the links, seems to me that's where it happened.
if it happened any where else in the cage there would have been blood for sure.
By the time we noticed, he was on the top perch, and dripping blood. we got him into the bathroom to get a better look, the blood was oozing out, his mouth was full of it too, ugggg.
we are thinking of vet wrapping the chains on the swing.