I had a bird who was prone to falling now and again and would need a feather pulled occasionally. I never disinfectant them. If your bird is relatively stable I wouldn't worry too much about it. Accidents happen and birds can fall. But I would keep a close eye on him to make sure the fall was indeed just an accident and not something like sickness that's causing him to be unbalanced.
Hopefully if feather has stopped bleeding it won't start up again. I'd leave it alone as long as doesn't reopen. If he bumps it or if he starts picking at it, it could bleed again. I had a self mutilator but he tended to leave blood feathers alone. So if you bird is in good health it should be unlikely that this will happen. I've had pull feathers numerous times so I don't find it that difficult but if you've never done it before you're best to go to vet if possible. You can accidentally injure your bird if done incorrectly. Especially true for smaller birds.
Anyway you're hopefully/probably out of the woods. But it would be wise to try and find an avian vet or emergency vet that treats birds in the meantime.
I hope it's just an accident and your bird feels better and you won't have to worry about it.
