He offers her a smile that's meant to be reassuring, but it seems more exhausted than anything else. It's kind of her to offer, but the sentiment is misplaced. This is something he has to do on his own, and he needs to keep the rest of them out of the crossfire.

"Thanks, but--

Hopefully she won't take this as poorly as some of the others, but what else can he say, really?

"--this is my fight."