So Itachi took a direct hit from Kirin?! Meaning that he has some serious tanking ability or that Akatsuki cloak was very durable....Itachi before Kirin struck.
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Itachi after Kirin struck
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There's more damage to his body and his cloak was erased.
This means, either:
1. Itachi didn't use Yata Mirror
2. Yata Mirror was bypassed by Kirin.
Take your pick.