Batman Meets the Key

The insane see Dawn Summers differently because she's the key. Bruce Wayne is insane (you know it's true!). Dawn goes to Gotham for some reason.

He doesn't say anything to her, except possibly if he's in the uniform. He might say something to his colleagues, especially if they're on patrol together(-ish) with open coms, or if he had reason to be worried that she might be a threat to Gotham.