Two days in a row! Second time this week!
Technically Ururaka just called Mineta unimportant which is 100% a fact

They danced cuz they recogonized the voice of the man. (The man was disguised as a villain. He was actually Present Mic.)
If they didn't know it was Present Mic or if it was an actual villain they would've tried to disarm and disable him.

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