I mean, I would just ask first before going in for the full body tackle. If she says it's fine then nothing happen and you go on with your life but if she says it's not fine then you still have the tackle option open. Still, kind of a shitty situation. You were doing a nice thing, he was trying to do a nice thing but it ended up being a bad thing.

"No good deed goes unpunished." And you got punished twice.

I see two chivalrous deeds and sadly it went wrong for both of you guys. Your female friend should feel great when she wakes up and is through the hangover. She has a good friend like you to look after her and a random guy sticking up for her too. I know in your head he seemed like a bit of a dick but I can't but think if he did/does the same thing in a situation where some poor lass was drugged then he'll save her from one of the worst nights of her life. Rape mentally scars.

No good deed goes unpunished my friend..

karma will get them