Coffee with a Gamer: Non Interventionism

When two people are fighting, do you jump in? is it a friend of yours and would you tell another person to fight for your friend? would you sucker punch the other person if your friend is losing? What if that isn't your friend? what if you do not even understand anything and the winners are the people on the sidelines selling bets and the guy in the top seat who pays both fighters to fight so the crowds pay.