If he's bleeding put him back in isolation till he's reasonably healed. If he just gets thumped good (and it's quite likely) it's good for him. He needs to learn manners. At his age he's not far off from becoming a testosterone filled douche. If they rough him up a bit now it will make him think twice before trying to get too cocky.
Edit: as long as he has adequate space to get away from the hens he should be fine. He should quickly learn to give them their space or suffer the consequences. This dynamic will change as he matures and earns their respect, but he deserves none of it yet and they should make sure he understands that.
Edit: as long as he has adequate space to get away from the hens he should be fine. He should quickly learn to give them their space or suffer the consequences. This dynamic will change as he matures and earns their respect, but he deserves none of it yet and they should make sure he understands that.