[He frowned at the question, as if irritated. It's the look of someone unused to not having his orders followed, perhaps (though in truth, he didn't think the worry, the suspicion was unfounded but he's not good at reassuring people).

So he can only offer the truth.]

I borrowed some spiritual energy from Jiuge. If we're going to work together it would make sense for me to share some of it with you. [And then, as if it'd be embarrassing if someone mistook the gesture for kindness.] It's just the logical choice.

[He was making some assumptions here. That what was afflicting them was sapping both their strengths--both physical and spiritual.]