Voldemort summons his Death Eaters by touching Pettigrew's dark mark, and reveals that his servant at Hogwarts ensured that Harry would participate in the tournament, win it, and thus be brought to the graveyard. Voldemort challenges Harry to a duel, and punishes Harry with the Cruciatus Curse. Harry tries to disarm Voldemort with the Expelliarmus spell, at exactly the same time as Voldemort uses the Avada Kedavra curse. The two curses meet and interlock, causing an effect called Priori Incantatem to take place. This bond between the wands causes the spirits of Voldemort's murdered victims, including Cedric Diggory, Bertha Jorkins, James and Lily Potter, and even the Muggle Frank Bryce, to spill out from his wand. The spirit victims provide protection to Harry, allowing him to escape with Diggory's body and leaving Voldemort in a raging anger.