
She does not need many words for the idea of protection to become very immediate around her.
Nezuko cannot explain the warning, so she shows it with movement; watch her hands, and you may save her chosen passenger.
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He is persuasive precisely because fear never leaves him before courage shows up.

He stands out because compassion never weakens his ability to act the instant action becomes necessary.

Tanjiro can smell the scent of people who have lost their names, and after feeling compassion, he severs the demon's aura.

His strength lies in his resolve not being weakened by the need for kindness.