How am I able to sober up quick when an issue arises.

So tonight I went to the bar after work, I didn’t eat anything all day so after a few drinks I couldn’t even walk straight. Within 1 1/2 hours a friend had issues and needed someone to vent to, I was literally sobered up in like 10 minutes? I’ve been able to do this, even when I’m near black out drunk. Is this normal? If so how does that work? I did have fun tonight though but I’m curious about this.