Unfortunately Luna's not yet savvy enough to recognize Capitol fashion relative to normal clothing (her normal includes a man in a giant metal suit, after all) so she hasn't yet registered Roland as a fellow Tribute. She does notice his hands on her shoulders, and her eyes are drawn to the mechanical fingers on his right one.

That's definitely got her attention now. Is he like her, then? Her appearance isn't so obvious and her fingers are smoother, but without her ABT she's not that different underneath. She's shocked enough that it takes her a moment to respond, and she backs up stammering her own apology. She knew she might bump into someone in these crowds, but it's still rather embarrassing. "No, no - it's all right. I'm sorry, I should have looked where I was going."