She hated that he was correct. Part of what made them both successful in their chosen careers as interrogators for the Ministry of the Magic was the fact that they were highly perceptive. It was an inherent trait that was hard to learn. Either one was effective or they weren't. Rabastan knew how to tell if someone was lying better than anyone Hermione had ever known. Even she wasn't as good as he was in that area. It was frequently a source of contention that crept up between them. He usually found it amusing that she would get frustrated with how easy certain aspects of their job came to him. She had her own natural talents, of course, but any time she felt less than another she longed to best them. Her streak of competitiveness had gotten her into a lot of trouble more than once. Likely it would continue.