old english game and belgian d'uccle are sick

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Hello
I have two roosters one is an old english game and got in a fight with another rooster. We had to break it up and when I picked him up he spewed and has only gone down hill since
We separated him his cone has gone really dull and floppy he keeps his head low and moves really slow.

My other rooster is a belgian d'uccle I only just got he was happy the last three days but this morning when I checked on them he was sitting by himself looking down I threw bread to him and he would not eat and I tried again this afternoon and he was the same.

Would love some help please!

 

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Is there a chance that the new bird was ill when you brought him in? Is there a chance he has caught something from your flock? Did you take any quarantine measures before introducing him?