Help I need advices asap hurt chicken leg

[Henefer feathers]

Thank you so much for reading this thread I appreciate it

Long story short i have about 13 chicken's born ending of September
I have a molten Java and a big orpington buff and a lavender orpington roosters

My orpington buff attacked my Java and now he does not want to put any weight on one of his legs , I separated my roosters and put my Java in a separate container. He's eating and drinking but he just doesn't want to walk. He still cockadoodledoo just not as much.
He been like this for a few days now.

Any advice would be greatly appreciated!!!

 

[Eggcessive]

I would separate the chicken into a dog crate near food and water. Vitamin B complex 1/4 tablet daily, and 1/2 of an 81 mg aspirin may help. Could the chicken have been acting odd or walking funny when it was attacked? Were your chickens vaccinated for Mareks disease? Chicken slings can be helpful with lame or disabled chickens to get them up and in frost of food and water for hours each day between periods of rest. Here are some examples:
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/

 

[Henefer feathers]

I would separate the chicken into a dog crate near food and water. Vitamin B complex 1/4 tablet daily, and 1/2 of an 81 mg aspirin may help. Could the chicken have been acting odd or walking funny when it was attacked? Were your chickens vaccinated for Mareks disease? Chicken slings can be helpful with lame or disabled chickens to get them up and in frost of food and water for hours each day between periods of rest. Here are some examples:
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/

No he was completely fine , and he comes from a really good bloodline of show chickens.
No they were not vaccinated and none of my other chickens are acting strange or lethargic.
I noticed him trying to bump chests with my buff and he is alot larger then him. He looks like a child standing next to him. If needed I could attach pictures of my buff.
But yah I'm just worried I'm new to this...
I just don't want to have to put him down if I could do something for him he is surprisingly really sweet and he likes to cuddle and love neck scratches.
I'm going to try and give him the cocktail you suggested and I hope it works

 

[Eggcessive]

Can he stand up at all? If you stand him up, can he walk? I would keep him quiet and let him rest, but make sure that he is drinking well and offer food. Hopefully, if it is an injury, he will feel better with rest.

 

[casportpony]

So sorry you rooster isn't well. I really hate to say this, but the way he is holding that one leg out in front of him is a classic Marek's symptom.