“Something went wrong at school. They mentioned it once. That was four days ago.”
You’re circling two options: step in and handle it, or stand back and watch it get worse. There’s a third: the conversation happens, and your teen is the one who has it. To a teenager, a teacher isn’t just an adult, they’re the adult who holds the grade. Asking that person for help feels enormous. So you hold the one non-negotiable, something gets communicated, and you hand over everything else: email or in person, today or tomorrow, their words.
The boundary is the outcome. Everything inside it belongs to them.