Umbridge didn't hesitate to complete her orders. Not for the first time Hermione thought about how remarkably pleasant she was under the curse. If she'd been aware that this was possible, she might have even been tempted to curse her years earlier. While Umbridge began the process of stunning each of the prisoners to prevent them from being witnesses to what was about to happen next, Hermione made her way to Aberforth's cell. She cloaked her magic to cast an untraceable unlocking spell on the door. Dumbledore didn't even flinch when his door was opened by an invisible hand. He must have been expecting her to return again at some point.