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Animuson nearly had hit the rep cap before that 5-point vote. He had already reached 195 points from upvotes by that point.
You can only ever earn 200 points in a day for upvotes on both questions and answers, but question upvotes only earn you 5 points at a time. 19 answer upvotes + 1 question upvotes totalled to 195, so the final answer upvote was capped to 5 points only to round up his reputation increase to 200.