He had known it was her - how could he not?  It took a few minutes of watching her, specifically how she moved when dancing with Blaise.  Granger carried more poise in her little finger than most pureblood girls did in their whole bodies, no matter if no one else would agree with him.  If he didn’t know it was her from watching her dance, he knew it the second he was close enough to see her eyes.  The very same eyes that had haunted his nightmares.  The same eyes that pleaded with him for salvation.  He couldn’t help but indulge himself in her presence once he realized.