Great shot and vid, that rifle hits hard...
Unfortunately I've seen that exact injury and others. All amazingly healed up, all handicapped but seemingly otherwise healthy. Possibly from years prior.
My bet, this was from a 'missed shot' leaving a wounded/deformed animal that has amazing healing abilities... Not saying it was from your missed shot, or a hunter/pester purposely leaving an animal to suffer. Sometimes as hard as we may try, the animal is no where to be found till it shows up limping healed up maybe fully or partially.
I'll admit this has happened to me. A couple years ago had the very rare miss. Was suppose to be a 45yard head shot, nutter jumped straight up then was gone nowhere to be found, no blood trail. Nutters are so squirrelly, moving quickly erratically its probably happened to some of us here also.
Well, about a month or 2 latter, saw this nutter limp up to the bait station on 3 legs. Watched him for a while. The same ball dragging large male with kinked tail. His front left leg all gimped up, a nub was left, all healed up. Amazingly he seemed fine with it, still fat and healthy other than a gimped front leg.
Thought ok better take him out of his misery and pop 1 to the head. But was watching him chase the females and feed like nothing was wrong. So thought ok, I missed and unfortunately caused pain and suffering, so decided to give him a permanent pass, no double jeopardy. I let him feed unfettered at the bait station. He still seems to be an alpha with a string of nutters following him to the bait station
. He's still breeding and a big good looking specimen probably giving good dna to the local herd... He still comes around almost daily, reminds me of my bad shot and his suffering. This has probably made me more patient and crafty on bait station construction/location.
jmo