Claudius presses Lan Wangji's hands for his own comfort, here. Naturally he doesn't care for the idea of some song that could ruin his health, turning his own body against him like the blood parasites did. With all his anxious, constant medicating and brewing of medications, it may be one of his worst fears. "He would've been covering his tracks, then," Claudius pieces together. "So no one would be able to read it there, and identify the same notes in his song. And that's what would lead to a death that appears to be by qi deviation."