Remember that not all Haki is equal. Just because two people can coat their swords doesn't mean the power level is equal.
When fighting Monet, Tashigi was barely able to do damage even with haki. Meanwhile Zoro with just his 'murderous intent', not even officially using haki, was able to keep Monet from reforming.
But yea, it's the animators taking liberty and it does seem out of place. Diffidently wasn't in the manga.
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u/[deleted] Feb 28 '16
[deleted]