Dr. reflex was in his office, doing whatever he needs to do when he hears a knock at the door. he expects it to be a student in this school and calls out.

DR. Reflex: "come in!"

after a few seconds he noticed there wasn't a response which confuses but slightly frustrates him. he gets up from what he was doing and opens the door to see who it was. but it was something he didn't expect to see.