Hmm, weird part of the story.. Luci and MC talking in the mountains. She asks "Do you think I'm insane?" with a yes/no response.
Either option she references some unknown 'she' that we as the players would know about, but the MC would have no clue since it was never mentioned from Luci, or anyone, to the MC that she saw some sort of 'vision'.
Yet the MC never questions who 'she' is from either answer. That's highly unusual since the MC is pretty perceptive, so it's hard to believe he'd overlook her talking about some unknown 'she' situation. Now if Luci had confided in the MC before that, it would have made a lot more sense.
Some might say that when they were in the jungle pool, and she was looking to the side, was cold for a moment and then warmed up it would give him some insight, but it really wouldn't do anything of the sort. All he knew was she was looking to the side, seemed afraid and then very aggressive in wanting sex.