I have this happen any time my serama roosters get too much time with anyone other than another serama rooster. I'm housing a rooster that got the snot kicked out of him by one of my serama. They're so nice to people but man they do not like other roosters.
You'll want to use lots and lots of wet soft tissue and vet RX on his eyes so he can see to eat and drink. I keep the wet tissue on for about 5 minutes to loosen up the scab tissue, then I'll swab it with vet rx and then finish up with some antibiotic ointment around the top and bottom eye lid until it's soaked in. This will keep his eyes soft enough to open and eat/drink.
I know this is an old post, but it's good info.