"Am I not just borrowing one of your classes?" Li Qiumei didn't think she had done anything wrong at all, "At worst, I can swap a class with you."
Now she was claiming it first, whether she would actually swap later on was another matter.
Chen Jie, looking sternly at a few students who had just returned from the restroom, said, "Teacher Li, I hope you don't waste our class time."
A class is only forty minutes long, precious indeed. With one extra problem explained, it's possible the students could score a few more points.
Being watched by so many students, Li Qiumei felt embarrassed and her anger surged. Chen Jie was less and less respectful towards her.
Li Qiumei decided to give Chen Jie a lesson to show him who had the real authority in this class. "Su Xiaohong, go call the principal," she said proudly, glancing at Chen Jie afterward.