Sometimes you're the pigeon...

and sometimes you're the statue. And some kid clearly beat this trumpet with a giant bronze pigeon.

That's part of the bottom cap there on the middle casing. The kid managed to break the cap part away from the collar and squish the bottom of the casing into an oval. 

Diagnosis: Beyond repair. Probably would have been an easy fix, too, if the kid hadn't tried to take matters into his own hands/channel lock pliers.