Have you ever seen a toy with a button on its back? You press it and it talks or moves. Some people are like that: their brother teases them (presses the button) and they yell right away! That's not cool. It means the other person is controlling you.
The Bible says the smart kid "stays calm." He's like an ice superhero. When someone tries to bug him, he takes a deep breath, holds his tongue, and doesn't explode. Whoever can stay calm wins the fight without even needing to hit anyone!