How do you deal with volatile situations when out in clubs?

I was looking at this girl the other day and a girl with a bf thought I was looking at her.

the guy got indirect and started saying 'I'll knock him out, I'll fuck him up' etc trying to be the tough guy in front of his girl. I knew he wasn't the real deal because he was being so indirect.

I always follow the 'it's always best to win a fight without fighting at all'

But I want to develop the mindset some of my friends have where they just switch and can fuck people up. It does get them into trouble though, but I would just love to know how to tap into it.

Any tips? would meditation help?