That is a lot of pieces of information that do not neatly fit into any pre-existing mental buckets and generate many additional questions, and Merrin is somewhat having difficulty catching all of them in her working memory. Really she should be taking NOTES, but it's going to continue getting colder in the shelter for the next six hours until dawn, and she doesn't...actually have any properly warm clothes...to offer Estha so that they can both get up and start working sooner. Except he did say - but this isn't the part of the day where the temperature is least survivable -
It's feeling weirdly high-friction for Merrin to fill in all of her mental blank spots around what Estha's "capabilities" and constraints are. Maybe it's just the bizarre language thing, where Baseline is apparently missing key vocabulary? Maybe he's separately being less than fully open with her but Merrin is not going to confidently conclude that yet.
...She very obviously needs to reassess the priorities she's had for months, and not just do the extremely tempting mental motion of deciding that she was managing before and now has strictly more resources and so everything is fine and not an a emergency.
They're almost certainly not going to die, today, and probably wouldn't even if she had an Estha to feed and shelter from the climate and he hadn't arrived with his own bonus specialabilities. But that doesn't mean nothing is time-sensitive. It sounds like Estha does, actually, think they have a chance of getting off this planet, not just eking out some minimal survival indefinitely, and it sounds like that relies on finding his missing gear, and that is time sensitive, because it's only going to keep getting harder the more tidal periods elapse.
Merrin's mind is having trouble treating this with the urgency it deserves, because it...doesn't, quite, feel real to her yet...but it seems like her brain is being silly, there.
(She got all of that thinking rammed through her brain mostly while Estha was still talking. She's getting the hang of this "interacting with another human being without having it accidentally overwrite her ability to maintain her own internal train of thought" thing.)
"I'm wondering if it's easiest for me to fill you in while you're using your - capability that your entity gave you," ???????, "to understand Baseline, and you have my vocabulary but not vocabulary for talking about your, um, entity? And then if you use the other capability that gives me your language, it should be easier for you to talk about the entity-related capabilities and fill me in?"