Talk:Reincarnation/@comment-70.140.138.180-20200220135757/@comment-198.48.229.134-20200731125815

"Demons" like Xiao-Bai does not need reincarnation. They simply don't die as long as they do not exaust their energy and self-destruct.

Demons lose their energy if they use it excessively, suffer from severe injuries or have their energy drained by others. "Cost" here refers to the energy cost. Trying to find Xu Xuan would likely be costly, because the world is a dangerous place - as pointed out by many characters in the movie.

In the sceen where Xu Xuan and Xiao Bai was flying together, Xiao Bai attacked one of her fellow snakes, nearly killing it. This counts as a severe injury and that snake lost his energy, The Snake Mother thus shared her energy to help that snake regain its lost powers, such as shapeshifting to half human form.