I am sure most of the replies will be like mine: I just cull them. You don't want the rooster on your farm. He needs to be made into soup. i love my chickens, but I want my children to love them too, and if a rogue rooster is on the loose, the kids will be afraid of chickens, maybe their whole life. Also, and more important, he can blind a child in just a few minutes. At the age you have, they are right at the level a rooster flogs, about knee high or so. So, this is an easy answer. No hard feelings for that mean old rooster, he is not worth a moments consideration if he is a man attacker. Fighting chickens do not attack man, as they have been bred selectively to NOT do that. Good luck, I killed three young rooster in one day that flogged (all the same breed/breeding) because my 3 y/o was terrified of them, they were relentless chasing her.
Henz