"Stop it right now! What is wrong with you?" (This shames them, which increases aggression.)
Either approach works. I'll need to flesh out one of these ideas into a full story. Let me go with the first fantasy example as it allows for more imaginative elements. Ensure that the story is engaging, has clear stakes, and positive messages.
If your child is losing fights consistently to the same child, you are not dealing with fighting. You are dealing with victimization. In that case, traditional conflict resolution fails. You must escalate to school administration and teach defensive assertiveness. kidsfighting.com
One of the hardest lessons at is that tattling is not the same as seeking help. Teach your children that if they are physically safe but just annoyed, they must solve it themselves. If blood is drawn or a weapon is involved, they call an adult instantly.
: If you are frustrated, your kids will mirror that energy. Take a deep breath or count to ten before intervening. "Stop it right now
We do not recommend children engage in street fights. However, if a stranger attempts to grab your child, all rules are off. Teach your child to bite, scream, kick the groin, and run. Self-defense against abduction is the only time "fighting back" is mandatory.
or Wrestling) over striking to minimize head contact and concussions. Let me go with the first fantasy example
"Fight Kids: The Future of Mixed Martial Arts or a Detriment to America's Youth". ResearchGate