I ditto what everyone has posted so far. If he were my roo, I would take warm wet wash clothes and soak all of that blood off of his head. Keep him warm, quiet, give hi protien foods, electrolytes in water and tons of TLC. I have had to doctor two birds that got into bad fights and both came back just fine. One hen that I doctored, is now missing alittle of her left eyelid and ear cover but it sure doesn't slow her down. The roo got beatup just like yours did and he also is fine. Hope that helps. Let us know how he fares.
