The Dancer V. The Dancer, #5

Dancer IV introduced two new main characters - Salmon and his sister Buttterfly. Salmon can ride skipping rocks. Butterfly can shimmer through walls. Hey, it's a magical series, so why not. Salmon, though loses his confidence in his ability to skip and ride rocks. His girlfriend, Dancer is encouraging him to try again. He wants nothing to do with it. But somehow he has to get his confidence back. Butterfly has disappeared.
Walks-Like-Thunder the horse god, the Director, and the Shaman have left for business on another world. But they didn't take Butterfly with them. As the Author says, "Maybe she fell into a wormhole and is now back at her old home. She did miss it. Nah, that wouldn't be it - wormholes are too normal to have any place in this story."Ramon and Raul have all of a sudden started weeping uncontrollably.
Nobody knows why. They haven't been moody since they and Magnifique were young. And they never wept uncontrollably before - at least not to Magnifique's knowledge. How will this all be resolved? And what's the surprise ending to this series?