Holy crap Sarah! Thats terrible about Gunner. That sounds like serious trauma. He was outside right? Do you think someone tried to steal him or something and he kicked out and did major damage? Or if someone tried to pick him up his ears or the scruff of his neck? Not you guys of course, but like a stranger.
Or maybe I'm way off base, but the first thing that came to my mind was someone who was inexperienced with rabbits trying to steal him or something.
Either way, its really sad.
I hope he continues to heal! I would be a nervous wreck as I bet you are. Hopefully tomorrow he'll be better than today and he'll do well at his recheck.