In the previous books, Harry is written as a child, but Rowling states that in the fourth novel, "Harry Potter and the Goblet of Fire", "Harry's horizons are literally and metaphorically widening as he grows older." Harry's developing maturity becomes apparent when he becomes interested in Cho Chang, a pretty Ravenclaw student. Tension mounts, however, when Harry is mysteriously chosen by the Goblet of Fire to compete in the dangerous Triwizard Tournament, even though another Hogwarts champion, Cedric Diggory, was already selected. It is actually an elaborate scheme by Lord Voldemort to lure Harry into a deadly trap. During the Tournament's final challenge, Harry and Cedric are teleported to a graveyard. Cedric is killed, and Lord Voldemort, aided by Peter Pettigrew, uses Harry's blood in a gruesome ritual to resurrect Voldemort's body. When Harry duels Voldemort, their wands' magical streams connect, forcing the spirit echoes of Voldemort's victims, including Cedric and James and Lily Potter, to be expelled from his wand through Priori Incancatem. The spirits shortly protect Harry as he escapes to Hogwarts with Cedric's body. For Rowling, this scene is important because it shows how Harry is brave, and by finding Cedric's corpse, he demonstrates selflessness and compassion. Says Rowling, "He wants to save Cedric's parents additional pain". She added that preventing Cedric Diggory's body from falling into Voldemort's hands is based on the classic scene in the "Iliad" where Achilles finds the body of his best friend Patroclus from the hands of Hector. The author said: "That [Iliad scene] really, really, REALLY moved me when I read that when I was 19. The idea of the desecration of a body, a very ancient idea... I was thinking of that when Harry saved Cedric's body." She also said that she cried while writing the scene when Harry's dead parents are drawn from Voldemort's wand, the first time she cried while penning her story.