Confused

He was wandering around in large circles, with long purposeful strides, while mumbling to himself. I watched him go by a few times, then approached him for a conversation. He did not really care for chitchat though he wasn't unfriendly at all. I pointed at my camera and he just shrugged and stopped walking for a quick pose. I thanked him and he resumed his pacing. I wish I knew what his story was...