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It now made more sense why Komurasaki had to wear the kitsune mask while playing that song. She still sounds suspicious to me, though, almost as if she's just subtly confirming details on the incoming rebellion plan.

So from what I'm understanding, this haki projection technique might be similar to D&D's touch AC attack (ranged touch attack, more precisely) if it simply goes through physical defenses like thick scales. Its effectiveness also doesn't solely rely on the user's physical strength considering how weak Hyogoro seems to be right now, which makes sense because "haki" pretty much means "willpower".