That seems to be that, at least until Akutagawa admits how he's feeling. She had noticed that his heart had begun to beat a bit faster, his body growing warmer, but had generally assumed it was due to the walk and the weather. But the young man should be more thawed by now, so it causes her to reassess.

"No, of course, please rest as you need." But she leans in, as if inspecting the flush on his cheeks. "Are you sure you're all right? I understand that many of the food and drink in Duplicity is at risk of having been tampered with." An experience of hers that's been secondhand, of course.