[He surprised that it did hurt. Why should he care? He doesn't, he thinks, but it's the assumption he would do it that annoys. Of course, he would obey his Master's commands, but to assume that he automatically would was... annoying to him.]

Perhaps I'm trying a different tactic to bring you to the side of the First Order

[He lets it hang and then]

But for now, I'm not. It wouldn't be worth it. Not here.