At the time, Snape was only 29 years old and became the youngest professor at Hogwarts. Despite this, he was already a strict and demanding Potions teacher. On one of these days, he would start his lesson again, which the students, regardless of the faculty, disliked so much.

"So... Today you will prepare the drink of the Living Death. And don't think I'm going to feel sorry for any of you. Everyone will get the grades they really deserve."