It's simple. We need each other. I need your brain. Chuuya needs my brain. Gogol wants to kill you, but he's agreed to hold off, and besides, I have a guard dog, don't I?

(fyodor certainly knows how chuuya is - he had taken control of him, after all. whether he is concerned about sigma or not, that makes no part of the conversation. he's got a plan, as he always does.)

Darling, you must answer, or else, I might as well just drop you tied to a rock at the bottom of this ocean, as unfortunate to me that would be.