I actually had this happen to me, but it was entangled in blackberry vines. With dealing with the vines and and a wing tearing at my flesh, I got him free enough to get himself out. I killed his buddy that was with him an hour later. I could have killed him, but his buddy presented me with a better shot and it seemed wrong to kill him after I released him. His buddy stayed just out of shotgun range and paced back and forth while I worked the bird free. Then they met up and were on their way, until I interrupted them an hour later.