It's rarely occurred to anyone. [A simple reassurance to give, since in his experience that's been simple fact. He's not about to tell her much else that is simple, so at least there is this.

But there is a lot else. He takes a bracing breath.]

He'll be all right. He's surprisingly durable. [At any other time there would be a joke here. Now, this is actually said with unconditional respect.] You did right. I know it, he knows it, and you'll know it too, at some point. But I expect it will be a while. It takes time, and... experience, to work off the effects of looking someone in the eye as you kill them.