Benjamin listened to the professor and heard the part about losing points and spending the week in detention. His eyebrows just raised and he said very quietly, "Ok." He practiced saying the incantation a few times then he brought his wand over to the lantern with the dull light and tapped it twice and said "Disillusiona". At once his lantern disappeared. He smirked and said to himself, "This can be a very useful spell." He then pointed where his lantern was supposed to be, and said "Finite". At once the latern reappeared. "Very usefull spell, Professor."