[Yeah, he just remembered that. His TARDIS won't be able to survive in this universe. That's, um, that's a snag in this whole 'staying and helping out' plan.]

[The other Doctor is getting excited, and what he's suggesting sounds - well, reasonable. But this multiverse thing is still somewhat new to the Doctor. He holds up a hand, not stopping his other, just stalling him.]

Just a second. You said we're in the multiverse, with no paradoxes, right? So if I were to bring my TARDIS here, she could keep a connection open to my universe to draw power without that doing any harm. Could she do that?