User blog comment:Godisme/Swords of Origin/@comment-1904799-20130117054204/@comment-1332195-20130117090541

Perhaps it's also an attempt to make Zaraki abandon his old 'hold back so you can enjoy the fight' philosophy; Surely part of the art of killing is that you actually want to kill them, which generally Zaraki doesn't, but it seems Unohana does.