[Hythlodaeus rubs Emet's back in an attempt to soothe, but stops at the question. It takes him a few moments to rack his own memory, but once he remembers - oh boy. He sits up abruptly, unaccustomedly serious, maybe even a little pale.]

... Elpis. An incident of some kind that tampered with his own memories. Something went wrong with a... device of some sort. In the memory, he was angry at having forcibly forgotten the couple days before that. Do you think that might be connected to why you are only remembering this now?