"What's the matter with you?" Ron didn't understand at first, but soon began to tremble, for Snape's gloomy voice came from behind him.
"You must mistakenly think that defaming professors is a very interesting thing and will not be punished, right? Weasley!"
When Ron heard the sound, he swallowed and felt a chill behind him. He turned his head trembling and saw Snape's gloomy face.
"Professor Snape..." Ron stammered with a stiff face.
He remembered that Snape had been in Quedi