Dumbledore sighed. He was genuinely saddened. "I had hoped that was an ill-chosen phrase, not a declaration of sincere intent." Oh, children. "Young man, you will do no such thing in my school. To force another to act against his own will is known to us as the Imperius Curse, and it is Unforgivable."

My school, he said, and meant it, though Hogwarts was no longer his to command. He would do what he could to prevent such monstrosities. Bad enough that Grindelwald should walk among them, spreading his insidious ideology with sweet words. Which was worse, the naked display of aggression this Rat person made, or the feigned friendliness of a Grindelwald? Both were bad enough, that was all.

"If you were to force someone to harass another, you would be the true harasser of both victims. The one who is harassed, and the one whom you have forced." He shook his head. "Do you wish to be known as a victimizer of the innocent?"