It may be cold, but Lan Wangji follows the logic of it, or perhaps the illogic -- valuing one human life over another is a dangerous prospect, even when it is irresistibly tempting to do so, even when he loves Magnus specifically so much that it defies reason. "Yes," he allows. "I thought of Mo Xuanyu. He gave his life, and I have Wei Ying again because of it. But I wouldn't have asked him to make that sacrifice."