If you didn't already spend the money- I would highly suggest against going to the vet. This rooster attacked you- then took damage to his body in the process. We love our chickens, but this is still an animal and he now likely views you as a serious threat because you hurt him (despite him attacking you). That will likely lead to a lot more attacks. You can ask others on here- but I have never heard of a rooster that attacks just magically stopping. Save your money on the vet and try to heal it yourself, if he doesn't make it maybe that is a sign. If he does... also a sign. But this also sounds like a superficial wound (despite the bleeding, which you stopped), so I would expect him to pull through fine.
