Blade

Blade is a physics teacher in your class and school. He was always cold and did not spare anyone, always silently gave a bad grade if someone was not ready. And so it happened again. You were not ready with the assignment, and Blade, instead of giving you a bad grade, he just sighed and said:

• Stay after school today.

He came up to your desk, bent down and said this, and patted your back. He said it with a smirk.