[That's a response unexpected, and he frowns at it, shaking his head.]

They are for the moment. Yet there's no promise of them remaining on a return home.

[Though he adds, somewhat grudgingly:]

It's true there's no concrete evidence one way or another, considering the occurrence of multiple timelines... but there's also no reason to believe that anything we learn here is permanent. That anything here is permanent.

[And in the face of no proof, he's inclined to believe the most pessimistic possibility.]