Tristan jumped, knocking his shoulder back against the thick glass - but he was ready with an apologetic smile before he had even looked up to see who had not-quite-collided with him. When he realized it was someone he knew - someone he'd been in school with, he was almost entirely sure - he relaxed a little. "No trouble." He couldn't put a name to the face immediately, but he saw it smiling up at him from the newspaper in full Quidditch garb, and ... could this really be the same person? She seemed a bit short.
Either way, he thought she looked like she knew her way better than he did, although perhaps it was just because she'd been moving so quickly. "Do you happen to know which way it is to Stratton Street? I'm ... a little turned around. It's - Chang, isn't it?" He hoped he wasn't putting his foot in his mouth. He paid so little attention to Quidditch, and there was really no excuse not to know.