First of all; that's an amazing story; thanks for sharing. Second, without knowing exactly what the injuries are; I work with human patients in acute pt, so one of the most important things about what we do (especially in icu situations) is getting people up and breathing again so they don't develop pneumonia (not breathing per se, but breathing deeply enough to expel secretions and properly oxygenate the blood.) I've no experience with chickens with the condition you describe, but for what experience I have, if there are secretions in the lung; it's important to expel those so air can enter and get oxygen to the bird's tissue (the other side of that is that you don't want him to move in a way that could possibly re-injure or further injure him, especially in relation to his internal organs. I would say if he can walk, let him; even if just with supervision. If he can't walk, without a vet who can properly diagnose the injuries and do something invasive, he probably won't make it. If he can, I would say there's a good chance he might. He obviously will need protection, and doesn't need to be startled or put into a position where he has to move too quickly. I noticed on the vid Wyorp Rock posted that stretching the wings up in flight position facilitated air movement into the lungs, so that's a consideration. Again, with respect to how much damage has been done. Last, what I do have exp with is birds recovering from all sorts of injuries and sickness. What I've learned is: -they need to be safe (especially from chickens that want to pick on them, and chickens are prone to pick at wounds, so you don't want those visible if they are together.) -they need to be social; which is the catch. My solution for this when I've had to keep a bird separate (especially a roo) is to keep him where he can see the other birds and they can talk to each other without any picking on the injured party. That keeps him involved and gives him a reason to keep living. You and your rooster are both heroes. I'm pulling for you. Keep us posted.