"That would make sense. He hasn't been in any of the other cars so far." Not that Ryo had checked the hindmost cars before heading for the kitchen, but Thanatos doesn't seem the type to spend leisure time in the triage or luggage cars.

"He's...I wanted to check on him. He was...upset, during the mission, and when I asked him if he was okay earlier today, he avoided the question." Upset is a mild term, but it's not his place to tell Thanatos' secrets.