Percy mentions returning, and Vex's expression shutters subtly. He's right that they're done here, and they'll need to be returning soon. But there are still several steps between climbing out of the pool and entering the inn. More space before they pass any point of no return for parting ways.

She shrugs, looking over her shoulder.

"I doubt anyone is out watching to road," she says, which isn't an answer.

It pushes the actual answer off a few more moments. "We can cross the next bridge when we get there."