After reaching their house, Rio instantly excused himself from Patricia and left for his room. He didn't want to start another talk and reveal something that could put his plans in peril. After all, even just talking about questions in a roundabout way won't save his secrets, as with her innate ability of color vision and blessing of probability, she can just cut whatever guesses she comes up with, until she finds the real reason and truth.
Color vision, an ability which helps one to see world in a form of different colors. Every emotion, every feelings and expression seems different in colors to the users eyes. Every sentiment and intention were laid bare to her, their true nature displayed in a spectrum of hues.
With this ability, lying to her was a joke. That's why Rio also said, she could perceive his bloodlust just by a glance, despite whatever barrier that seprated them.