Draco eyed him sidelong for a moment, then nodded. "You taught me one, my Aunt taught the other." And he felt himself skilled enough it both to protect himself, even if he didn't like using Legilimancy. His own thoughts were oppressive enough - wallowing through other people's left him ill. "Are you offering up your mind for proof?" How would be sure that was honest, with as good a Occlumens Snape was?