Harry announced his plan to find an unknown, hidden object in the castle to defeat You-Know-Who.When he mentioned it had something to do with Ravenclaw, Luna Lovegood (Evanna Lynch) suggested it was Rowena Ravenclaw""s lost Diadem, or tiara-like crown.Returning from the Underworld, she is befriended by them and apologizes for startling them: "Please don""t run away.There were four guards, full-time, two on each rooftop.Stickel added (referring to the first film): "Langley was a cakewalk compared to this." Ethan""s dangerous plan was to swing from an adjacent taller building onto the rooftop, and exit by base-jumping off the roof with a chute, although it was only 162 meters tall.She realized that the celebration wasn""t very traditional: "This isn""t the Junior Chamber of Commerce, Brad!" Janet began to whine and complain: "Look, I""m cold and I""m wet, and I""m just plain scared.