Hermione didn't really have a choice. Ron knowing that he had made a mistake was going to have to be enough. The name Rookwood didn't mean much to her, at least until she took in his unfinished sentence. She supposed he could at least be happy about that part of the end result. "Well done," she told him, though the words sounded hollow, even to her ears. While she appreciated the fact that Ron felt some kind of vindication in bringing Rookwood down, he hadn't even known it had been him in the first place. It all came down to luck. All of it.
She looked across at him as he asked her if they could figure it out. "I don't know." It was the second time she had said that in as many minutes, and Hermione wasn't used to being so clueless. Not knowing was something she hated, but there was nothing she could look up in a book right now that was going to tell her the right answer.
"I should probably go," she said after a moment. "Don't they always say you're supposed to get some rest?" She wondered if that could apply to the both of them. She needed to think, without Ron looking at her like that and without the constant reminder of how easy it was for things to go wrong.