Bummer. Damn bird wouldn't stand still. I took some feathers off one a few days ago that was doing the same thing. He turned just as I shot. At least that's my story, and I'm sticking to it.
Looks like a direct hit on the heavy wing bone. Turkeys are fairly light so they actually move with the arrow at impact, which goes a long way toward reducing penetration. Combine that with tough feathers (takes a tin snip to cut them off the wing) and a direct hit on the bone, and the arrow just didn't make it into the body cavity.
A game of inches. An inch lower, and I think you would have had a dead bird. Sometimes, stuff happens.
The arrow will break off, and I wouldn't be surprised if the broad head eventually falls out. Going to be vulnerable to predators for a few days, but if he makes it that long, he'll probably be OK.
Just bad luck.