Periodically in the series, the topic of comradeship or friendship arises, with a male ally who works with Bond on his mission. Raymond Benson believes that the relationships Bond has with his allies "add another dimension to Bond's character, and ultimately, to the thematic continuity of the novels". In "Live and Let Die", agents Quarrel and Leiter represent the importance of male friends and allies, seen especially in Bond's response to the shark attack on Leiter; Benson observes that "the loyalty Bond feels towards his friends is as strong as his commitment to his job". In "Dr. No", Quarrel is "an indispensable ally". Benson sees no evidence of discrimination in their relationship and notes Bond's genuine remorse and sadness at Quarrel's death.