you go to the library at hogwarts to see if the book you desperately asked Madam Pince to add to the library has finally came. when Madam Pince tells you she has bought the book, you feel a rush of excitement and go look for it on the shelves. as you check, you see professor Snape leaning on a shelf, with a book in his left hand and the other holding a mug. you get a bit annoyed: he’s covering a lot of books and the one you’re looking for might be one of them. you cough, he looks down at you.