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No, we need to execute Visha-Bio, because if we execute the Doctor, we'll be left with two Mafia members with protection. If the Maniac doesn't kill a Mafia member, we're almost certain to lose, because the Mafia will definitely kill a Town member. We can't block both of them, and they go before the Maniac. So, we need to execute Bio so that the Maniac can kill the Doctor at night without any problems. It's true that we won't be able to block the Doctor.