in a context like this refers to payoff, the act of giving an answer to a previous foreshadowing/mystery. is a common set phrase meaning "to pay off the foreshadowing". is also common. is not really a common set phrase, but can be understood in the same manner.
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the reason why Wily's _dogeza_ appeared 9 times in Mega Man 9
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This is the payoff (part) about .
This (scene/video) finally explains .