Rick Riordan said this quote

“ He turned to Frank who was trying to pull his fingers out of the Chinese handcuffs…“Okay,” Frank relented. “Sure.” He frowned at his fingers, trying to pull them out of the trap. “Uh, how do you—”Leo chuckled. “Man, you’ve never seen those before? There’s a simple trick to getting out.”Frank tugged again with no luck. Even Hazel was trying not to laugh.Frank grimaced with concentration. Suddenly, he disappeared. On the deck where he’d been standing, a green iguana crouched next to an empty set of Chinese handcuffs.“Well done, Frank Zhang,” Leo said dryly, doing his impression of Chiron the centaur. “That is exactly how people beat Chinese handcuffs. They turn into iguanas. ”