The Vasher and Night Blood Story

Vasher and night blood story is clearly one of the linking pieces, you know, the puzzle is being built on both sids. It doesn't seem like anything that i can predict. Sompari someone like an azure, whose very character motivated, like she has her own internal right and shea going forward. And vasher is just kind of chilling ya. But there is a big question of, like, why? How it's interesting for a character to lack that type of narrative momentum.