That made Oli stop laughing rather effectively. Percy sounded serious and he wasn't one to joke about such things. Oliver wasn't quite sure what to say. He also said 'thanks', which was even more ridiculous than Percy complimenting him in the first place. This was just so unlike any conversation they'd never had, that Oliver was startled by it. "You think so?" That was just as stupid as saying 'thanks', but it was out and Oli couldn't take it back.