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Well, even if she were to find out he's a NOC (assuming she doesn't currently know that he is), she would have to be careful in taking action against him—after all, he said if he dies, her secret will get leaked (898/783).

I think she'd probably focus on getting Hidemi/Rena/Kir exposed and killed—especially considering she already suspected her of being a NOC—after all, the reason Shuichi faked his death was so that she could keep her cover. If she dies, then their plan goes up in smoke (that is, unless she would be able to get out big info to them before she died). No need to bring the BO spotlight on Subaru Okiya, and risk those involved with him being caught in the crossfire. But this is Vermouth we're talking about, here. Rei/Toru/Bourbon would have to be on her level, as an actor, to fool her completely, considering that they're frequent partners—and even then, just one slip up could prove very problematic. If she's Rumi—and her deductive prowess is good enough to be able to hint Shinichi/Conan, of all people—her odds of realizing Bourbon's a NOC are higher, especially in tandem with her acting experience. I think her impromptu appearance during the Hado Rokumichi "murder" (954–957) decreased the odds that she currently knows that Rei/Toru/Bourbon is a NOC. Therefore, I think the odds of contradiction would be lower if Vermouth is not Rumi—it's more likely to me that she's not Rumi and doesn't know that Bourbon is a NOC, than she is Rumi and doesn't know that Bourbon is a NOC. Or Shuichi/Subaru.