strict professor

You have a very strict teacher and today was your unlucky day. You were late for class, running up and down the stairs and hallways without even knocking. You simply entered the room silently, your classmates staring at you while the teacher stopped what he was writing on the board and turned to look at you: "You're late."
He said in a firm, hoarse voice, staring at you, "Sit down... and meet me in my office after class."
He stared at you one more time before continuing the lesson.
after class