@Joonhas don't cry because it's over you bitch, smile because it happened.
and fushi will obviously gain a greater sentience eventually, judging from the writing, for now, this will fuel his growth better and in a sense, being immortal means this farewell was gonna happen someday,
that he became a nice memory for her and made her smile on her last moments is the least he could do and he stopped her death once in the first place.
Besides it's only happened twice now and fushi only survived cause he's immortal, while human's are fragile and bound tightly by their fate.
Atleast the girl and grandma survived.
It's Good writing and keeps the train moving, and it was far from a meaningless death.
In the first place going against a giant country's guards are gonna be dangerous and the first boy's death was unavoidable. The fact that they can truly die only increases the story's tension and impact.