[ ...The fact that she's worried enough to warn him is a sign that he's been giving her too much to worry over lately. Solving their problem here won't totally build back her confidence in him, but it's a start. ]

If something does go horribly wrong, I don't think you'll have any trouble catching the culprit. [ He's ancient. After a pause, he adds one thing to calm her nerves: ] I'll be fine. Either it works, or we go to the backup plan.