Who says it's a demon? I didn't see any evidence that Nasu is a demon...he WROTE on Oga's tattoo, it's not his, notice the marker in his hand when he gets up behind Kanzaki.
That said...it wouldn't be the first time that strong badasses show up, get hyped up only to get horribly beat down by Oga and the others. And honestly, aside from demons and other supernatural beings I don't mind seeing Oga completely destroy humans without much problem.
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