She shook her head at her students. "That's actually exactly why. Professor Snape's life hadn't been the best, and when he met Lily Evans, that was the bright spot for him, and it remained his bright spot throughout his entire life. That was the only reason that he still could summon a Patronus." Alyss finished, smiling at the students. "Grey Magic. I will put up a list of spells on the board, partner up, and brainstorm how those spells can be used for either Light or Dark purposes." She turned to write on the board, listing off the levitation spell, stunning spell, the Unforgivable Curses, freezing charm, banishing charm, summoning charm, and the petrifying spell. "And go."