[The Doctor hop-steps every ten paces or so too keep up but brisk walks are one of his many specialties.

He doesn't contest the explanation, he has seen things more impossible than this. The fact that he may have lost his memory of this place is troubling and a thought that he chooses not to explore at this time.]

Is there any reason for it? It must take an awful lot of resources and energy to kidnap people and hold them here only to release them again. And from different universes and timelines as well.

What could the purpose possibly be? [This last question is more to himself but it's unlikely Darkleer would realize it as such.]