Sounds like mentally he is still in that dog fight
The way you describe it, its like he wants revenge. I don't know if thats possible, but I'm guessing a dog can hold a grudge. Redirect him, do some short training exercises with him, get him around stable dogs he knows and learn to read him.
Misty- Samoyed Mix
Tannor- Golden Retriever CGC
Robyn- German Shepherd CGC
Cats-Thunder, Harley, Miley, Bandit, and Ferah
RIP Boo..Black Lab
"A dog is the only thing on this earth that loves you
more than he loves himself."