We were harmonious siblings, but you can't expect this group of brothers and sisters to share your values. Perhaps this is why Stone killed Daiyu. Little Knife couldn't accept the order to expel Daiyu from the base, and it was unlikely that Lin Wu and Daiyu could live together peacefully. In Stone's view, Daiyu was bound to become a point of conflict for the small team.
This kind of matter had to be handled with care.
Of course, there was no problem with the Nightmare mission, because the stance of the Fortress and the Alliance was uncertain, and being neutrally informed meant naturally you could do anything.
