"Sorry!" Harry gasped as he was helped to his feet. "I really - I - there's someone - " he looked over his shoulder, gasping for air, and was surprised to see nothing at all pursuing him. There was just the path he had come, blurry and indistinct without his glasses, but there was no movement in it that he could see. He sagged a little with relief. "Thanks," he said, sheepishly, turning back to the new stranger he had cannoned into. "Yes, I er... think I remember." The truth was he found it hard to keep the members of his own family straight, let alone other people, but he didn't want to be impolite. "Sorry," he said again, dusting his new clothes off and looking around squintingly for his glasses.