I didn't know the judge showed Mirai Mori's end I thought she once had a human who died

i think it was more on one of what if scenario since the future has several breach of path. I forgot which chapter but it is for sure when they fight for mori to live with them rather back into salim domain or another human settlement

Well not really a what if scenario, more like something that will happen. It was letting her know that humans have a shorter lifespan than they do so she will eventually have to see him die. It was a way to see if she was prepared to deal with that.