Any parent will tell you that someone has to intervene when two kids are bashing each other up.
And call for time-out session.
Let them come back another time.
Instead of making a spectacle like that which does not benefit anyone.
But then, not all are good ‘parent’.
Cos some ‘parent’ are so power crazy, they prefer to keep quiet and let the ‘kids’ kill each other, all the while, hoping the preferred ‘kid’ will win the fight, regardless if the kid is playing by the rules.