It suddenly dawned on her that during her own working hours, evidence was obtained from surveillance cameras. Therefore, there should be even more surveillance in the school.
"Teacher, there should be plenty of surveillance cameras in school, aren't there? Fetch the footage from the classrooms and corridors. I want to see who is bullying Jin Lin."
The teacher was reluctant to do it but had no choice. After all, the injury on Jin Lin's ankle clearly wasn't self-inflicted, but if this issue escalated to long-term school violence, it would certainly harm the reputation of the school.
In that case, her position as homeroom teacher would not be secure, and not just in this school but perhaps every school in the city would refuse to hire her.