From Inside the Grey House:
Natalia was having a hard time holding the sword in her hand. The cut from earlier was bleeding freely. It wasn’t a deep cut, but it ran the length of her lower arm. Theodore had raked her arm with his thumbnail, digging in deep. It was making her whole arm throb, and Vincent saw the pain. She could switch to her left hand, but her right was stronger, even cut. Therefore, she hid the pain, channeled it, and held her ground. When Vincent stood, she held the sword at the ready. The vampire’s eyes were still on her arm. He watched as a single drop of blood fell from her arm to splatter on the hardwood floor. Natalia watched his reaction but missed the significance.