I stared at the river far below. "Why did you park us on the mountain? Why not closer?" Bast shrugged, as if this hadn't occurred to her. "Cats like to get as high up as possible. In case we have to pounce on something." "Great," I said. "So if we have to pounce, we're all set.
Rick RiordanWhen Luke had descended into the River Styx, he would've had to focus on something important that would hold him to his mortal life. Otherwise he would've dissolved. I had seen Annabeth, and I had a feeling he had too. He had pictured that scene Hestia showed meโof himself in the good old days with Thalia and Annabeth, when he promised they would be a family. Hurting Annabeth in battle had shocked him into remembering that promise. It had allowed his mortal conscience to take over again, and defeat Kronos. His weak spotโhis Achilles heelโhad saved us all
Rick Riordan