It’s time to pay the piper,
In the fable, the town of Hamelin hires someone to get rid of a plague of rats, which he does a magic flute. But the town balks and doesn’t pay the floutist, so he performs his trick again—the second time with all of the town’s children. Revenge is a bitch.
In this verse, the phrase means that anyone who has tried to take advantage of Evidence will soon regret doing so.
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