Mafia 112. Pirates of the HW Sea

Okay. But all my questions remain after replacing the word "Cop" with the word "<whoever has the sparrow role>..."

I agree with you that there's no point in blocking the Cop if they've already been checked. But blocking someone else, whom they considered a Kraken, for example, is a perfectly valid move. But they ended up targeting Jack, who then redirected them to the Cop. My theory is that's exactly what happened.