Luther didn't analyze her movements too much. It was too crowded here for her to attack him, too many people were watching of her to get away with it. People did know him here and she - well, he assumed she was as reclusive socially as she'd been on the forums. He returned the nod, hands remaining at his sides as he did so. Not threatening - that wasn't his intention.
"Where are you off to?" He didn't expect an answer; he had a good enough guess on why as well. The lack of a real trail in Miami had done that.