"...I can't say I'm an expert. I know they exist, and certainly they work as advertised, but - you're saying that there's a soul that was present in this moment, also around now and acting independently?
"Because - as best I can tell, it's still those times in the bubble, such that incautious dismantling would snap us back. Which is..."
"Bloody hell I do not want to deal with a McFly situation.
"Okay, brief digression into time travel mechanics and possible outcomes of acting, given this information:"
She'll throw up some diagrams, green, blue, red - after a moment's thought, she crosses them with a magenta starburst and branches to indicate her arrival as a potential complicating factor.
"There's three models of time travel that tend to be thrown around.
"The first is the constant-universe model, and it's usually the most accurate one - but I cannot say that it's 100% true here.
"Effectively, in the constant-universe model, you cannot meaningfully affect the past because if you were going to do so, you've already gone back in time and meddled."
The green diagram shows a closed loop, effectively. Her magenta knocks the forwards march of time askew but doesn't break even the loops that occur after her.
"The second model is the many-worlds interpretation, where every instance of 'time travel' heads to an alternate universe, instead. I don't think that's likely, however, because you wouldn't be able to sustain this in those conditions."
The blue diagram, many worlds where time travelers jump across lines. Her arrival colors one magenta.
"The third model, though, and the one I'm worried we may inhabit, is the single rewritable timeline model. That one gets...complicated. Very quickly."
The timeline animates; people duel across it, painting it practically all the colors of the rainbow as they war over fixed points along it.
(It's basically a game of Continuum, that she's animating live.)
"I don't want to risk writing the universe out of existence while I'm - while anyone's - in it."
"I don't suppose any of you have a way to tell whether we're in case one or three, before I start thinking about whether breaking the first rule of time travel and time loops in general - which is, to put it succinctly, 'Don't' - is viable?"