Rosa nods to Faust. That's what she had in mind. "My train of thought, exactly. It's good to see the priest has done his homework."
She watches the priest, narrowing her eyes. "Things are going to get complicated. You're not far from the truth, really. Our master makes uses of a variety of catspaw, fronts and retainers. There's some level of, let's say, competition between each and all of them. Consolidation is obviously to our master's best interest." She pauses again, obviously gauging the priest. "Here's what's possible: I say you stop your little side hustle for a couple weeks, time needed for us to, ahem, negotiate with our competitors and things to settle down. On your side, you learn anything more about our competitors, you get us word. Once we're done, on our side, we promise we'll get a you a preferential rate on the cut, going as easy on you as possible. That works for you? I think it's in your best interests we succeed, don't you think? Better the Devil you know." Rosa smiles, once again.
Spoiler: OOCIt's not like he really gets a choice, here. Furtha may reasonably believe that if we go down, he goes down with us. I don't think it's necessary to make explicit the threat of taking precautions for information about Furtha to reach the church leaders in case we turn up dead. He's a smart guy, can figure it out on his own.
Still, it's still a step further into the bluff so in case another roll is required: Deception - (1d20+2), Advantage - (1d20+2).