"Visiolectri!’ A dim, brief glowing at the end of his wand was the only indication he had cast anything. His wand tip had dimmed again, and he had reoriented his wand and removed his hand long before Umbridge looked in his direction again, having noticed nothing. Hermione however, was staring at him, and had clearly caught something. He shook his head discreetly before she could ask a question and give him away. The only thing he didn’t like about this jinx, was how long it took for its effects to become apparent.