You will find ambiguity a great ally on your road to power. Give a sign of Slytherin on one day, and contradict it with a sign of Gryffindor the next; and the Slytherins will be enabled to believe what they wish, while the Gryffindors argue themselves into supporting you as well. So long as there is uncertainty, people can believe whatever seems to be to their own advantage. And so long as you appear strong, so long as you appear to be winning, their instincts will tell them that their advantage lies with you. Walk always in the shadow, and light and darkness both will follow.
I know that you are preparing to fight." There were screams amongst the students, some of whom clutched each other, looking around in terror for the source of the sound. "Your efforts are futile. You cannot fight me. I do not want to kill you. I have great respect for the teachers of Hogwarts. I do not want to spill magical blood." There was silence in the Hall now, the kind of silence that presses against the eardrums, that seems too huge to be contained by walls. "Give me Harry Potter, " said Voldemort's voice, "and they shall not be harmed.Give me Harry Potter and I shall leave the school untouched. Give me Harry Potter and you will be rewarded. "You have until midnight." The silence swallowed them all again. Every head turned, every eye in the place seemed to have found Harry, to hold him forever in the glare of thousands of invisible beams. Then a figure rose from the Slytherin table and he recognized Pansy Parkinson as she raised a shaking arm and screamed, "But he's there! Potter's there. Someone grab him!" Before Harry could speak, there was a massive movement. The Gryffindors in front of him had risen and stood facing, not Harry, but the Slytherins. Then the Hufflepuffs stood, and almost at the same moment, the Ravenclaws, all of them with their backs to Harry, all of them looking toward Pansy instead, and Harry, awestruck and overwhelmed, saw wands emerging everywhere, pulled from beneath cloaks and from under sleeves. "Thank you, Miss Parkinson." said Professor McGonagall in a clipped voice."You will leave the Hall first with Mr. Filch. If the rest of your House could follow.