Rosalie is rather too stunned to say anything for a moment.

"Oh, I... I'm sorry..." Her cheeks instantly feel warm. But while her tone of voice would seem to indicate that her blush is shy and apologetic, inside she can feel the anger start to rise.

How dare he embarrass her like this... And why is he looking at her like that?

"I, um... I don't believe we've been introduced," she mentions, her tone still airy and light (and still somewhat hopeful). She raises her right hand slightly, daring him in her mind to refuse to take it-- unaware that he can hear it, of course. Just out of sight, she clenches her other hand into a fist among the folds of her dress.