"Yes," he says grimly. "You should. However, it ought not to have been nearly as dangerous, since the werewolf, unlike the troll, was known to exist by the faculty at large, and was both able and willing to participate in negating the danger he posed. Until the bloody idiot lost his head and forgot to take his potion." Severus doesn't care what dimension he's in. Magic works, Voldemort is dead, those who are here are here, the rest is detail.
"Y-e-es," the word draws out of him slowly. "There were a number of problems with that course, though. Petrifying your body was not likely to have had any effect on your mind or his, for example. Albus thought the best chance of preserving your sanity and... one or two other things... lay with allowing the Dark Lord to believe himself unnoticed.
"It's a different Malfoy," he says with a small smile. "The one you'll have known of was on the side of the Dark Lord and on the side of Lucius Malfoy. This one, I believe, has always and ever been on the side of the Malfoy family. The one a snake, the other a serpent." He shrugs. "Slytherins of certain years... you must expect them to have been unable to avoid association with the Dark Lord. He recruited the shamefully young, with both consummate skill and inescapable force, and as many were cozened and pressured to serve him against their better feelings and judgments as did so gladly."
"Molly." He rolls his eyes slightly. He approves of social ambition, but ye gods, Molly Weasley. "I believe this is a... a cousin or granddaughter or some such. There was a daughter, though. Ginevra. But the Miss Weasley under discussion has to do with owls in that, as a witch in temporal attunement to her surroundings, might know from where to rent them."