Between 2 adults.
- Mind your own business and walk on?
- Break them up and become involved in the fight?
- Watch and see what happens?
Just last Sunday alone, I've seen 2 heated arguments that could have resulted into a fight. All of them were spilling vulgarities and 2 of them were displaying acts of 'courage' i.e. bumping each other on the chest, shouting out loud, instead of settling things sternly but calmly.