He speaks up barely after she's done, and her arms tighten around him over it. It's a sentiment she has to believe. Tartarus will be the worst thing they ever face, and they have to get through it; if they can do that, they can combat everything else, too.

And if she says anything right now, it might dampen how much she's clinging and believing in it. So instead, she just hugs him even more tightly, but the feeling's there in her grip - she doesn't know how to fight it either, but they will. If there's anything she's realized in her friendship with Percy, it's that he's always there, he always comes back, no matter what happens. And she needs that as much as anything. "We won't," she repeats finally, softly but no less believing. Even if they don't know how, getting past this sort of thing has always been them. She has to keep fighting against the idea that this time it might not.