"Already did. It's why you can't sneak up on me anymore." Trunks replied with a small smirk. "It's harder to sense, here in the Library. They limit a lot of things that might be dangerous." Cocking his head, concentrating again to sense her ki. "Human, not trained in martial arts, but you've had some practice shielding. There's also something else, some kind of anomaly. It might just be because you're a time-traveler, or it might be something else." A shrug. "I can't tell clearly, here. Ask me sometime when we're in a book world."