In the process of trying to get to the di Angelos , a manticore ( Dr. Thorn ) attempts kidnaps Percy , Bianca , and Nico , only to lose them to Thalia , Annabeth , and Grover . In the process of trying to get to the di Angelos , Dr. Thorn ( who is a manticore ) attempts to kidnap Percy , Bianca , and Nico .