From Inside the Grey House:
He was starting to show his feelings. His jaw was twitching and he was taking deep breaths. His hands were behind his back, forming fists. All she had said was true; he had been using her, but not quite consciously. He hadn’t been able to find out whom she was killing, but knew it wasn’t anyone under his protection. Since Edwin wasn’t calling him to find out if it was one of his people, Vincent let her do as she pleased. He was afraid of her dying but knew she could take on most of Edwin’s men.