Su Bing was well aware that even if he knew Zhou Hua was the one who made Sun Wei lose Su Li's homework on purpose, Zhou Hua could still argue her way out of it. Even if the situation escalated, the school wouldn't expel her over such a minor incident with unclear evidence. This time, he decided to handle it himself, to teach this Teacher Zhou a lesson and make her behave more modestly in the future.
After a moment of silence, Su Bing turned to Su Li and said, "I just remembered something. It's my turn to be on duty today. Su Li, you and Gao Ming should go home first. I'll come back later on my own. Please tell mom for me. Also, about the incident where Teacher Zhou falsely accused you of not handing in your homework, don't tell mom about it yet. She's been working hard lately, let's not worry her."