The best advice I recently got when my hen suffered an attack (also lost sight in one eye), was to keep her hydrated. She started eating some pellet and scratch a few day later. I kept her hydrated using a medicine syringe with straight Children's Pedialyte (for water with electrolytes). I also incorporated some watered down baby food like sweet potatoes, which helped with her strength. Your rooster is certainly in shock and needs what others have suggested, a dark and quiet place. You'll need to sit down 4-5 times a day and offer water and food via syringe for at least the first few days.
Good luck!!
Mama Knucker Hatch
Good luck!!
Mama Knucker Hatch