[It says a lot that that piece of information actually does reassure Light.]

And if it was going to happen, it would already have happened. I know. But we can't trust that. We can't assume the mansion's good nature, in that regard. Someone could be brought in tomorrow, freshly infected. The place loves trauma. Or—

[More tea. Yes. His hands don't tremble; instead, he becomes even more still, and quiet, and prepared, and now what's left of the defensive brightness in his voice is wholly gone.]

"People involved with the Kira case". My father would certainly have been involved, if Sayu was. He didn't make it out of Japan.