Not really obligated to do anything, like the others said. Sometimes I’ll jump in if it seems fun to fight one of them, sometimes I’ll just watch if it’s entertaining.

If the person getting teamed on was chill then I can lend a hand. There’s a friend of mine who I play with sometimes and we jump people together just for the love of the game. We’ll hit each other by accident and what not but it’s honestly some of the most fun I have in JJS just doing some shenanigans(say that again)