Sounds like you did the right thing to me.
Of course, you didn't mention what happened to you but kudos for stepping up. Sometimes even if you get hurt, if you were doing it for the right reasons, it's worth it.
I was ok fortunately the hitter (slightly drunk)recognized me as an acquaintance as I yelled at him to stop and he stopped without pummeling me too. I actually was grabbing his arm with both of mine and he had me almost lifted off the ground as he stopped his forward motion. (I was pretty darned scared) 6 security guards showed up and I talked them into letting the big guy and me leave without a scuffle, told them I would make sure he didn’t come back as we headed for the door....Diplomacy worked well..he was ready to take them all on, raised his hands with fists, and told them not to touch him, and they obviously didn’t want to take him on. I helped everyone save face and defuse a bad situation.
I forgot to mention he was about 6’7” 300 # and past pro bouncer...He was previously working as a bouncer and someone hit him with a beer bottle in the head from behind and he turned around and pulled the guys throat out...he served time for excessive force on that one. They hitter had to sweat it out 3 days to see if the guy recovered, which he fortunately did. Haven’t seen him since.