Severus’ mouth forms into a thin line, and he nods. "He knows. That old coot is a lot of things, but an idiot he is not." He leans further into the tree they’re hiding behind. "Therefore, he is smart enough to know that when accusing someone like this," his forehead scrunches up in irritation or concern, but Remus can’t be sure which one, "you better be absolutely sure, and without solid proof, you're wasting your time."