There's some kind of feeling that Thanatos gets, looking on this person. Like he should recognize him? But he supposes that's ridiculous- if he'd escorted this man to the Underworld, he'd probably remember him too.

"So it would seem", he replies after a moment spent studying the stranger with a frown, as his body were pasted with clues, and Thanatos only needed to puzzle them out by looking at them long enough. "It's becoming tiresome, wandering these halls. Or rather... this hall. How strange to come across another in the loop that I've been doing."

He speaks as if he has only mild interest. That couldn't be further from the truth, but he is trying to keep up the cool and calm aesthetic. Death doesn't panic! "I suppose that means you know of no exit yet."