It might not have been the way the Doctor was imagining, although there had been times when the wormholes did malfunction or put them in dangerous situations. They'd almost lost Quinn in the astral once because of such an event. But on the whole, the danger came from places other than the vortex, minus a little inadvertent limb flailing.

And she could tell he was mostly coming from a place of concern, which made her soften a little.

"It can be, yeah. And that's something all four of us have paid for over the years. My Quinn isn't even the only one. Several of his doubles have invented it. There's at least two other civilizations that knew the secret too. I wish I could explain to you how it was possible. Maybe if I could we could find a way to get out of here. But I don't."

Something else occurred to her, however. A distant ray of hope in his earlier words.

"You said you've done it, though? Could you do it again?"