Ursula
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The meaning is obvious; they have a Mafia member who is revealed.
The Mafia member can only reveal the Guard; the Guard himself cannot kill the revealed Guard. This means the Guard needs to convince the others to help him. But this is risky, and it's not certain that the Guard will do it.
So, why does the Feral Mafia start revealing themselves? What does it give them? Well, we'll hang you, a peaceful player; your role will be revealed after the execution, and everyone will know that it's the Feral Mafia. So, what's the point of all this?
Какую бы чушь ты не нес, в ней всегда есть крупица правды.