Put that way, there's two obvious answers.

The first answer is that the locality of physics is being violated, contrary to his previous metaphysical belief that causal relations only applied over local neighborhoods within a reality-process.

Wherever he is, it's not adjacent to the moment in space and time of his crashing plane.  Taking things at face value, and ignoring all pranks and Conspiracies in his first attack on the problem, both himself and some group of people from an alternate quantum-branch or future of dath ilan, have arrived to some third place not yet named and which is unfamiliar to new arrivals.  There's no story explaining that which involves amplitudes proceeding through the local causal neighborhoods of quantum physics as he knows it.  It involves action at a distance, or even if there was a continuous action through neighborhoods, they are not the neighborhoods he knows.  They are, almost equivalently, faster than light, or sideways in time.

The second answer is that anything which could violate the physics that he knows, on this scale, ought to involve some pretty clever contrivance, whose origin ought to be intelligence, and not the intelligence of the dath ilan he knows.  That intelligence ought to be optimizing for something.  Then having him appear naked in a cave is not visibly optimized for much of anything in particular.  The moment he appeared could be optimized for preventing his true-Death but, like, where is all of the other optimization here?  It looks like, or has been made to look like, an accident or a spontaneous phenomenon.

Do new arrivals always appear in exactly the same place?  He has already seen enough to infer that (taking the Others' words at face value) new arrivals do not appear at predictable times, or not exactly predictable times; there was a duty officer who had to come down and find him within a couple of minutes of his appearance.

Put that way, there's two obvious answers.

The first answer is that the locality of physics is being violated, contrary to his previous metaphysical belief that causal relations only applied over local neighborhoods within a reality-process.

Wherever he is, it's not adjacent to the moment in space and time of his crashing plane.  Taking things at face value, and ignoring all pranks and Conspiracies in his first attack on the problem:  Both himself and some group of people from an alternate quantum-branch or future of dath ilan, have arrived to some third place not yet named and which is unfamiliar to new arrivals.

There's no story explaining that which involves amplitudes proceeding through the local causal neighborhoods of quantum physics as he knows it.  It involves action at a distance, or even if there was a continuous action through neighborhoods, they are not the neighborhoods he knows.  They are, almost equivalently, faster than light, or sideways in time.

The second answer is that anything which could violate the physics that he knows, on this scale, ought to involve some exotic contrivance, whose origin ought to be intelligence, and not the intelligence of the dath ilan he knows.  That intelligence ought to be optimizing for something.  Then having him appear naked in a cave is not visibly optimized for much of anything in particular.  The moment he appeared could be optimized for preventing his true-Death but, like, where is all of the other optimization here?  It looks like, or has been made to look like, an accident or a spontaneous phenomenon.

Do new arrivals always appear in exactly the same place?  He has already seen enough to infer that (taking the Others' words at face value) new arrivals do not appear at predictable times, or not exactly predictable times; there was a duty officer who had to come down and find him within a couple of minutes of his appearance.

Put that way, there's two obvious answers.

The first answer is that the locality of physics is being violated, contrary to his previous metaphysical belief that causal relations only applied over local neighborhoods within a reality-process.

Wherever he is, it's not adjacent to the moment in space and time of his crashing plane.  Taking things at face value, and ignoring all pranks and Conspiracies in his first attack on the problem:  Both himself and some group of people from an alternate quantum-branch or future of dath ilan, have arrived to some third place not yet named and which is unfamiliar to new arrivals.

There's no story explaining that which involves amplitudes proceeding through the local causal neighborhoods of quantum physics as he knows it.  It involves action at a distance, or even if there was a continuous action through neighborhoods, they are not the neighborhoods he knows.  They are, almost equivalently, faster than light, or sideways in time.

The second answer is that anything which could violate the physics that he knows, on this scale, ought to involve some exotic contrivance, whose origin ought to be intelligence, and not the intelligence of the dath ilan he knows.  That intelligence ought to be optimizing for something.  Then having him appear naked in a cave is not visibly optimized for much of anything in particular.  The moment he appeared could be optimized for preventing his true-Death but, like, where is all of the other optimization here?  His isekai looked like, or had been made to look like, an accident or a spontaneous phenomenon.

Do new arrivals always appear in exactly the same place?  He has already seen enough to infer that (taking the Others' words at face value) new arrivals do not appear at predictable times, or not exactly predictable times; there was a duty officer who had to come down and find him within a couple of minutes of his appearance.

Put that way, there's two obvious answers.

The first answer is that the locality of physics is being violated, contrary to his previous metaphysical belief that causal relations only applied over local neighborhoods within a reality-process.

Wherever he is, it's not adjacent to the moment in space and time of his crashing plane.  Taking things at face value, and ignoring all pranks and Conspiracies in his first attack on the problem:  Both himself and some group of people from an alternate quantum-branch or future of dath ilan, have arrived to some third place not yet named and which is unfamiliar to new arrivals.

There's no story explaining that which involves amplitudes proceeding through the local causal neighborhoods of quantum physics as he knows it.  It involves action at a distance, or even if there was a continuous action through neighborhoods, they are not the neighborhoods he knows.  They are, almost equivalently, faster than light, or sideways in time.

The second answer is that anything which could violate the physics that he knows, on this scale, ought to involve some exotic contrivance, whose origin ought to be intelligence, and not the intelligence of the dath ilan he knows.  That intelligence ought to be optimizing for something.  Then having him appear naked in a cave is not visibly optimized for much of anything in particular.  The moment he appeared could be optimized for preventing his true-Death but, like, where is all of the other optimization here?  His isekai looked like, or had been made to look like, an accident or a spontaneous phenomenon.

Do new arrivals always appear in exactly the same place?  He has already seen enough to infer that (taking the Others' words at face value) new arrivals do not appear at predictable times, or not exactly predictable times; there was a duty officer who had to come down and find him within a couple of minutes of his appearance.