D'Artagnan has observed most of this from off to that side, leaning against the wall of the shelter with his arms folded. The possible explanations are of various degrees of plausibility to him, ranging from seeming not very likely, to being incomprehensible. Radiation? An artifact connecting multiple worlds??

He speaks up, tone a little wry.

"She's right." Meaning Dolores, simultaneously the only one making any practical sense, and the only one dressed in a fashion that might not turn heads where he's from. He's personally dressed for travel and battle, his clothes all toughened leather and his sword hanging at his side. "We need to find people. That's the only way to truly explain any of this. For what it's worth, I'm fairly sure I was asleep. I probably still am. Unless we find someone who knows, any guess is as good as another."