Im just saying that Nen started off as bloodlust and Haki also started off with fainting as well.....
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Show isnt supernatural...but it is superhuman. I could see a powersystem somehow implemented for only strongest in the verse....seeing as we still havent seen a proper fight between them yet.
It could explain things such as Nagumo's ridiculous ability to shapeshift, Sakamoto weight manipulation, Akira and Satoda's "paths", and a lot of other unexplainable abilities in the show.