In Hanyu's memories, the Second's disciples all seemed to have had decent endings. Most of them eventually became pillars of Konoha. Whatever the cause of death, they could all be considered to have lived to a ripe old age by a shinobi's standards.
As for the two who became advisers, there was Danzo, who became part of Konoha's dark side. But even Torifu Akimichi was still able to fight alongside the Third Hokage during the Nine-Tails' attack.
...Everyone except Kagami Uchiha.
Hanyu remembered that Kagami Uchiha had died young, barely past twenty. But in his mind, an Uchiha who used Susanoo shouldn't have died. It wasn't until Sanshao revealed this shocking fact that Hanyu realized it was all happening right before his eyes.
Clearly, his "impression" had been wrong. When an Uchiha faced a situation that called for using Susanoo in battle, there were probably only two possible outcomes: either they slaughtered their way through the enemy, or they were killed.
Well, that was stating the obvious.
Kagami Uchiha had been a passing acquaintance of Hanyu's, so the news of his death merely struck him as a little hard to believe, and nothing more... Besides, he had already witnessed the Second's death firsthand, and had understood all along that:
Anyone could die on the battlefield. Kagami Uchiha's death was nothing unbelievable.
"The camp was ambushed, and the highest-ranking commander on the front line was killed. Konoha's morale will probably sink again, and the balance that had only just stabilized will be thrown into turmoil... The Second Kazekage really did land a fatal blow." Though this was a severe blow to Konoha, Hanyu had to admit that the Second Kazekage had chosen the perfect moment to strike.
Based on Sanshao's information, Hanyu naturally assumed that Kagami Uchiha had died at the