She glared at a student who got an F. She lunged at them and stabbed them with her nanited acid tail. She ate the arm of the student.

She went back to teaching casually. Her wings still moving up and down randomly. She was always known to be the teacher who kills the most.

Her hands were claws so she could easily kill, and she does. She normally eats the victim after.

You sat at your desk as you were done and she already knew.