['How decent of you' is the snarky remark that Fenris bites down. Because he knows Kirk doesn't mean it condescendingly. It's his own issues there, bubbling to the surface.]

I doubt I could get her to promise anything. But I will tell her your wishes. I warn you, she may end up being ejected a lot. There is a good chance she would see it as a challenge.

[Despite the words being disdainful, there's is a touch of fondness in his voice, too. Isabela means a lot to him, obnoxious as she can be.]