She didn't have the first clue which of the unfortunate prisoners was his latest victim. If it was Aberforth, she assumed that he would throw that knowledge in her face as some sort of cruel taunt. Rabastan knew there was more to her connection with the elderly wizard than she was willing to admit. He could be frighteningly perceptive. But, she knew her Co-Head well enough to understand that he played numerous games at the same time. To assume that one knew all that he was up to was foolish and almost always entirely incorrect. He could be simply waiting for her to ask him what he had been up to. Doing that granted him a level of power over her that she didn't like.