Lupin's briefcase slipped from the desk; he had to stoop quickly to catch it.
¡°Okay,¡± said Harry. He took a bite of the chocolate and watched Lupin extinguishing the lamps that had rekindled with the disappearance of the Dementor. A thought had just occurred to him.
Harry left the classroom, walking along the corridor and around a corner, then took a detour behind a suit of armor and sank down on its plinth to finish his chocolate, wishing he hadn't mentioned Black, as Lupin was obviously not keen on the subject. Then Harry's thoughts wandered back to his mother and father ¡
¡°But James Potter insisted on using Black?¡±
¡°Here! Just now! Slashed the curtains! Woke me up!¡±