He arches an eyebrow at her, then lets his eyes drift closed. "I see it almost all the time. What does that mean?" It's hard to gauge, from his tone, whether or not this is intended as a merely rhetorical question. It's possible he's unsure, himself.
"Your point is noted, although if I ever do fall off the tightrope it's unlikely I'll be aware of it until it's too late." He's fairly certain anyone in the vicinity at the time will have no doubts, but that will be more their problem than his.