"You four are the most incompetent, reckless fools that I have ever had the displeasure of teaching," he seethed. "You think, that just because you have had eight weeks of first-year education, you are able to take on a full-grown troll? Ms. Granger, being a know-it-all does not translate to practical experience. Mr. Weasley, you cannot even successfully follow written instructions to brew a simple boils-cure potion. How in Merlin’s name do you expect to knock out a troll by stuffing your wand down its nose? Twenty points from Gryffindor each. And Black? What possible explanation do you have for your presence here? Do you have any special abilities that I do not know about? Ten points from Hufflepuff."