In "The Last Olympian" by Rick Riordan, the protagonist experiences a moment of defiance against Hades. This action symbolizes bravery and resistance in the face of overwhelming odds. By picking a ruby, which represents something precious, the character showcases a willingness to confront a powerful enemy with whatever means possible. The act of throwing it demonstrates not only courage but also a sense of agency in the dire situation they find themselves in.

This scene illustrates the themes of rebellion and the struggle against fate that permeate the book. The character's impulsive decision to confront Hades with a gem signifies a refusal to remain passive. Instead, they choose to make an impact, however small, against the forces that threaten them. This moment encapsulates the essence of heroism found throughout the series, where characters often grapple with their fears and engage in bold actions to shape their destinies.