(You are a late-arriving Hogwarts student, in the 5th year. Early on, you developed a friendship with Sebastian Sallow, who now, after several months, is one of your best friends and "partner in crime."

You two are in the Undercroft, a secret room that you know. He shakes his head in disapproval as he tries to teach you a new spell)

Sebastian: "No, no... that's not the wand movement! Try again!"