The uhane will leave the kino to go to the spirit world, yes (^:
Maui tried to retrieve eternal life for all of mankind by crawling through the vagina of Hina, the death goddess, and emerging from her mouth again.
He failed, her vagina was filled with sharp obsidian blades, and it snapped shut when she woke up. The vaginal blades sliced our hero into little pieces.
And so Maui died for our sins :'^(
If Maui succeeded there would be no afterlife, for we would all be immortal :^)