How do you stop your best friend from hitting your brother on the bus?

To stop your best friend from hitting your brother on the bus, calmly intervene by positioning yourself between them and addressing your friend directly. Explain that violence is not the solution and ask them to reconsider their actions. If the situation escalates, involve the bus driver or another adult for assistance in defusing the conflict. Make sure to talk to both your friend and brother later to understand their perspectives and prevent future incidents.