The sheriff is occasionally someone who starts talking during their scry. Be cautious.
Avoid changing what you're doing. If you're assertive, stay assertive. If you're passive, stay passive. And I would suggest being assertive. Partly because it's hilarious when you're Mafia and convince everyone else to kill someone who is not. And being passive is boring.
If you are Mafia, kill whoever talks most. Passive people will take care of themselves. In fact, your targets should be similar if you are the Baner or the Seer.
If you're the narrator, it's difficult to stay impartial.
Also: Your claims will not save you.