They are indicators of Zoro using's Enma's ability.
It was purple, at first when Zoro's use was crude, clumsy, and unstabilized.
Now that it is green, it's telling us that Zoro has Enma's ability refined.
That's the thing. The illusion isn't exactly real. So he'll be seeing fake perceptions in the future. Similar to how Caesar hallucination gave him a false perception on what was occurring for the Germa's to escape. But sure, agree to disagree
Asura is a manifestation of Zoro's spirit/will creating an illusion of his body being omnidirectional. I believe this manifestation/illusion won't be able to accurately detect Zoro's strike using FS. The illusion gives a false narrative per say.
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