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I don't really believe in Sareth's connection to the mafia, to be honest.
As for Koshi, I don't know. On the one hand, there's no reason not to believe the Master, but on the other... I'm not sure if this isn't a mistake. As I understand it, he redirected Koshi that night, right? But, strictly speaking, that doesn't guarantee anything. Although, one could argue that blocking Koshi was a rather obvious move, there was no information about her, and so on... But I don't know. I need to think about it.