Nope! His lower legs are both encased in splints that look similar to the ones on his forearms - and don't look like any material recognizable in Golarion - and there's a shaped block of some sort of absorbent material down there too (for pee-catching purposes), but he's not tied down to anything and will be able to withdraw himself from the sleeping bag with no difficulty. 

All right then, Esta will go about extracting himself from the sleeping bag, though with some watchfulness to see if there are any unexpected stabs of pain; and if there are not, he will stand up, and perform a little hop and then a larger jump by way of final test.

"I do stronglyexpect I would notice if my legs had stayed broken; and on this basis, I determine that on this occasion you are the one with missing, fabricated, or modified memories."

....Yeah, okay, Merrin is going to go with the cluster-of-observations where he's obviously fine and not the detailed model of how biology that confidently predicts he should not be fine because that way she gets to sleep. 

"Drinking water's in the cistern over there," she says, gesturing vaguely at it. "Food is in the grey boxes – um, left one is cold storage, there's some snail, I'm fairly confident it's nontoxic to eat insofar as I believe I have memories of eating it for months without ill-effects - right has crackers made from local plant matter and what's left of my rations from dath ilan, you're welcome to eat those first, they're better. ...I'm gonna get in the sleeping bag now, you can join me when you're ready to sleep again?" 

And unless he has a counterargument or questions - which to be clear would be so reasonable of him, that was spectacularly sloppy explanation - she'll do that and close her eyes and be asleep within thirty seconds. 

Poor Mariona has been eating snails!  Well, such is the fate of those who do not reach Asmodeus's 3rd circle at least.

...or those who forget Him entirely.  For the language they were speaking has no word for gods.

There are words that suggest themselves as associated, but when Esta whispers them under his breath, they prove to mean different things once spoken; superintelligence might as well describe Nex as Asmodeus, unless Esta is missing something about the concept of great Cunning.

Esta is hungry, as he has not been in literally years.  It makes sense, if little Mariona had no concept of what those strange hoops of metal were doing on his fingers, and whether they were good hoops or bad hoops; but it is still hugely inconvenient and will be for a full week.

He may as well get started on Create Food and Water... or no, first he ought to look around his surroundings.  If Mariona has thrown away his unholy symbol and his rings, Esta will be very displeased, for that would be folly and not just uncertainty.  And what has become of his armor?  Most importantly, his Bag of Holding?

His rings and unholy symbol are very easy to find! They have been carefully laid out on a very worn and stained but currently cleanish scrap of absorbent cloth (the specific ultra-durable, machine-woven synthetic-fiber textile is in fact completely unrecognizable to Esta), on top of a table that from a distance looks like ordinary wicker and is, on closer inspection, instead entirely woven out of what appears to be leathery strips of dried seaweed. 

His clothes are in a pile on the floor. (Merrin did cut them in a few places, and initially tried to leave as much intact fabric as possible but ended up concluding that the fabric quality was inexplicably abysmal anyway and it wasn't worth that much additional time and attention and risk to his broken bones to salvage more of it.) 

His armor is also on the floor in a pile. And also appears to have been cut into pieces in the process of removing it from his body, which should not really be possible. (And will remain entirely unexplained, because Merrin's tiny shelter cannot afford clutter and she needs to make her tools last and so she immediately put everything away, including the tungsten carbide powered hand saw.) 

Of course!  What healer stripped of all her magic -- whose 2nd-circle magic would in any case not begin to accomplish such a thing -- could not casually cut magical armor off of her patient if it was in her way?  Why, how would that not be easier and faster than pulling it over the patient's head?

Mariona has some extraordinarily dangerous specialabilities that Esta knows nothing about -- either because they are new to her, or because he has forgotten them himself.

Other than that, there's indeed a freshwater cistern (also woven of seaweed, and lined with a transparent, flexible, and startlingly tough material that Esta will not begin to recognize), with a pipe made of the same material running along a ceiling strut from outside of the shelter and apparently draining into it, though there's no water-flow through it now. 

There is a pile of storage boxes, also with a design and made of materials that are completely unfamiliar. 

The shelter - which he can now see is half formed from a limestone cave - itself looks remarkably stable and solid and well-constructed, for something that is, again, entirely and completely woven of straplike seaweed; there's no sign of something as ordinary as wood, around here, only bizarre impossible Dark Tapestry materials and literal dried seaweed. 

There's a lot of strange black cords, mostly tucked out of the way behind the storage boxes. One of them leads to the oxygen concentrator, which unless he's removed the cannula himself, is still then connected to him. Another leads to an even more bizarre Dark Tapestry contraption that straddles the narrow mouth of a tunnel leading into a darker, deeper cave, and seems to be forcing bursts of even chillier underground air into the interior of the shelter. 

The two grey boxes, if he opens them - they're latched but it's an easy design to figure out and they're not otherwise locked - then one will indeed prove to contain half-melted iceblocks and then chunks of pale meat contained in bags made of the same transparent material, and the other will contain woven baskets and crude baked-clay bowls of very odd-looking flatbread-cracker stuff, and also a small number of even stranger, not-particularly-foodlike items, sealed in some sort of shiny colorful material. 

The lighting comes from odd strips of some material adhered to the woven ceiling or struts. If Esta tries Detect Magic, they won't Detect as magical at all. 

The strange adventurer-armor he saw her wearing before looks even stranger up close, where it's been leaned against the limestone wall, standing up by itself; it seems to open at the back like a mouth, rather than fitting over her in pieces, and it's also made of a material that does not look like metal or leather or anything else he recognizes; it's mostly a matte dark grey, with some reflective patches, and it's very very sturdy and hard but not quite as rigid as metal. Another, thicker black cord runs from it to disappear behind the stacked crates. A small status light is blinking on one side of the helmet, which is fully sealed with some kind of hard, transparent material that resembles but definitely isn't ordinary glass. (It also does not Detect as magical.) 

What there's no sign of, anywhere, is his Bag of Holding. 

He'll get around to that level of exploration shortly.

The first thing Esta does is cast Detect Magic, in case he can find his Holding Bag somewhere unobtrusive -- though he may well end up blinded, or his sight obscured, by all of the obviously magical objects around him.

Right.

Well.

Working theory, the Dark Tapestry Inversion effect transforms items it touches, to run on principles so alien that Detect Magic can't see them at all, let alone analyze them.

...there's a little bit of magic coming from one side of the waist-section of Mariona's transformed armor.  Esta stares at it hopefully, analyzing it for three moments, until he realizes it's his own fucking Continual Flame headpiece stuffed into a pocket.

His Holding Bag -- containing the Plane Shift tuning forks that were his primary hope of departing this place successfully, and a Sending scroll, and many other useful and expensive and did Esta mention helpful things for emergencies -- is nowhere to be seen, by plain vision or Detect Magic.

Maybe it's behind an inch of metal or a thin layer of lead.

Perhaps Asmodeus will see fit to grant Esta many Locate Object spells the next pseudoday; and he and Mariona will be able to find his Bag without it having been swept too far away by that Suddenly River.

Perhaps his Bag was punctured despite its combat chainmail shielding.  Perhaps it has been swept away too far to ever find again.  And if so, they are not getting out of here short of Aspexia Rugatonn using Discern Location and showing up with a Gate.

Esta is aware that he is permitting his thoughts to be disorganized.  Still.  It will be hard to think of things systematically until he has finished thinking the thoughts that just throw themselves at him immediately.

One of his first thoughts is to use the Greater Make Whole spell that Asmodeus saw fit to grant him; it has the very obvious intended use of repairing Esta's armor.

(It's because Incredibly Lost Squirrels surprisingly often end up next to some mysteriously half-destroyed magical object, which could be very useful to them, if only it were repaired somehow.)

...but he hesitates before the cast.  Esta feels naked without his armor, for reasons including but not limited to his actually being naked.  But it is possible that Mariona will speak to him of some other thing that needs repairing even more, or more urgently.  Esta is not accustomed to treating his 4th-circle spells as irreplaceable and valuable; but he does not, at this point, know if he can just get another Greater Make Whole spell tomorrow.

He thinks next the thought that wishes to intrude itself:  Things transformed into Dark Tapestry forms seem to become noticeably more powerful.

Mariona's Worldwound armor was solid workmanship of Cheliax, but Esta rather suspects it cannot begin to compare to the smooth alien metal of the glowing alter-magical Thing that it became, after being t̷̯̏ō̷͙͌ú̵̬͝c̸̽̅͜h̸͈̆͠e̴̘̻͆́d̶͓͉̒ ̶̬̊̂b̶̪͇̓͠y̷͇͌̀ ̵̤̀͒H̵͇͋̔ỉ̶̱̇ś̴̢̺̔ ̸͈̀͠ń̷̨ö̴̩͘ỏ̵̼̱̉d̷̨̎̓ĺ̶̹̔y̷̨͑ ̶̫̽a̶͚͐p̷̱̂͝ṗ̵̘̟e̸̻̠̓̀n̷̹̄͐d̴̲̆a̷̦̐͋g̸̲̀̆e̴̹̅́.̸̭͇͐̔  Her army-issue nonmagical dagger, perhaps, became capable of cutting through Esta's magical armor as if it were linen.  Or perhaps it is Mariona herself who gained the power to cut what should not be cut.

It is not a strict improvement.  Mariona was able to bring Esta back from death after he drowned; but also she was surprised at Esta's healing, she remembered no way to mend a broken bone but time.  Even his 2nd-circle capabilities may seem as miraculous to her, now, as hers to him.

It seems unguessable whether he or altered-Mariona would win in a fight, if it came to a fight.

And then there is Mariona herself.  Who, after having had something happen to her that may be akin to Dou-Bral's transformation to Zon-Kuthon, now seems to, well, to like him.

Or, like the version of him that she now remembers.

Esta does not know why this thought seems to weigh so heavily on him.

It ought to confirm everything he has ever told himself about how the two of them previously had a rigorously proper and nonheretical Asmodean relationship.

Perhaps his intuition is trying to tell him something important.

That is probably it.

Vicar Esta will now carefully search for reasons why his first thought on this matter would be false.

(As far as almost any mortal in Cheliax knows, after all, that is exactly how cognition is supposed to work and the whole point of thinking!  First your brain decides what to believe; and then, you go search for acceptable reasons to believe it!

If Asmodeus had promoted Esta to His 8th circle, Aspexia Rugatonn would have taken him carefully aside; and explained to Esta, and Esta alone, that this is not actually how thinking works.

Besides Aspexia Rugatonn, the only other humanoids in Golarion to figure out explicitly why not to do that, are a handful of Irorians in a Vudran temple who are treated with great suspicion for their unorthodox practice of passing around a +6 Wisdom headband in their daily meditations.

Somewhere on a vastly more distant planet with highly anomalous lunar eclipses, the actual majority of people who could correctly and rigorously explain in words why that is not how thinking works, are unusually attentive readers of Thellim's blog.

So not actually just a Cheliax problem.  But Cheliax does have it noticeably, if slightly, worse than usual.)

Dou-Bral, who previously preferred not to kill Himself, did not prefer to kill Himself after He became Zon-Kuthon.  Why not?  Because the new version of Himself could now do things that pleased His new sensibilities.

Perhaps altered-Mariona and remembered-Esta -- Estha, she called him upon his awakening, and Tongues agrees that 'Esta' does not sound right in her new language -- perhaps those two did other things together.  That Estha preferred -- no, that she preferred.

That possibility does seem to quiet whatever his mind was trying to yell at him, the discordant intuition... yes.  Esta would not have expected Mariona to stab him in the back on a moment's inattention unless she could thereby take his place or gain some great benefit to herself; and honestly Esta would not have expected Mariona to do it even then, but that is because Mariona is silly.  The point is, she did not like the pain and the sex that he inflicted on her, and she did enjoy the benefits of his mentorship.

This version of Mariona, then, probably likes being hurt by him and having sex with him, and dislikes him assisting her career, and so Chaotic Good Estha has been having sex with her and torturing her but not promoting her to command of Worldwound fortresses.

...Esta has a feeling that he has not fully sorted out the key ideas, here.  He doesn't think Caydenites or Desnans torture each other for fun?  But then this is Dark Tapestry inversion and not just moving around the alignment chart.  Zon Kuthon is strange for Lawful Evil, because most Lawful Evil proceeds from vastly more sensible foundations than 'do the opposite of whatever Chaotic Good would do'.