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Because he revealed himself. Even if it's not true, it can be checked somehow. He can no longer be executed.
Rimpi, I didn't force him to reveal himself)) This is just awful.
1. Checks if the selected target belongs to the Mafia.
So, you checked him, realized he was Mafia, decided to execute him, he revealed himself as a Cop, and then you decided not to execute him, right?