Constanze became very aware that she was staring then. She wasn't one to shirk away from people. She had just been tying to place where she had seen him before and for the life of her, she couldn't figure it out.
When he approached her she looked at him, considering his question. She shook her head, "No, it's alright. I was actually thinking the same of you but I'm having a really hard time trying to place you." She looked him over. She knew she had seen him before.
After a few moments she had a mental image pop up in her head and she made a face as though she had just scored a point in a game. Then it went away and she frowned, "well I had something for just a split second and it went away."