The rivalry between Angier and Borden dominates the film. Obsession, secrecy, and sacrifice fuel the battle, as both magicians contribute their fair share to a deadly duel of one-upmanship, with disastrous results. Angier's obsession with beating Borden costs him Cutter's friendship, while providing him with a collection of his own dead clones; Borden's obsession with maintaining the secrecy of his twin leads Sarah to question their relationship, eventually resulting in her suicide when she suspects the truth. Angier and one of the twins both lose Olivia's love because of their inhumanity. Finally, Borden is hanged and the last copy of Angier shot. Their struggle is also expressed through class warfare: Borden as "The Professor", a working-class magician who gets his hands dirty, versus Angier as "The Great Danton", a classy, elitist showman whose accent makes him appear American. Film critic Matt Brunson claimed that a complex theme of duality is exemplified by Angier and Borden, that the film chooses not to depict either magician as good or evil.