No kills is good, and it sounds like from the flavor at least one, maybe two people, would have used abilities that should have given them some good information.

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Trigger happy makes me feel vig initially, but if someone is denying a gunshot, that could be indicative of it being the mafia attack since a second person is trying to cover for the sound.

Stopping all the commotion seems odd, I don't think there is an ability thats like a blanket role stopper or something like that.