Jason wakes up in chains, thinking he might be dead, but then he has a vision. (Every time these kids close their eyes they have a vision, just about. You'd think they'd get tired of it after a while.)
He sees an earthen cage with tree root tendrils around it. Inside the cage is Hera.
Hera says she can't get out of the cage, which we knew already (otherwise she wouldn't need to be rescued… duh).
Hera explains that she thinks Zeus is being silly by keeping the Gods from contact with the world and closing Olympus.
As Juno, Hera is guardian of the state of Rome, and felt she had to protect folks. She heard a voice telling her about the spot with the cage, so off she went, but then she got trapped. Bad move, Hera.
Apparently this same thing happened before too. So really bad move, Hera. Learn from your mistakes, would you?
Monsters and wolves start to come out. Hera tells Jason to skedaddle, and says she won't be strong enough to appear to him again.
She also tells him he's a bridge, and that a dangerous mortal enemy waits in Chicago who might kill him.
Jason would like more useful info, but that's the end of this scheduled vision.
Jason awakens on the dragon, then they all do that thing where they tell us about things that already happened in the book in case we forgot.