It's all AU.

Back and forth, all this shifting back and forth. There had to be a way to stabilize something so that doors didn't randomly open and let people stumble in and out, between the limbo of this place and hours or days or years somewhere else.

But that would take Tosh, at the very least. And Jack for guidance. Or to shake his head and tut when they messed it up again, but it had to start somewhere.

And Jack, in his greatcoat, just down the corridor ahead of her, was where she'd start. "Jack!" She ran to catch up.