Bella also discovers that her power of mind-privacy has a shielding effect and she wonders if she can extend this protection to others. During the month of preparation for the Volturi, several of the vampires with quantifiable supernatural talents teach Bella how to expand the barrier. When the Volturi and Irina finally arrive, all of the vampires and the werewolves meet in a clearing in the forest. The Volturi discover that they have been misinformed and immediately execute Irina for her mistake. However, the Volturi are not satisfied to leave because the Volturi leaders want the exceptionally gifted vampires to join them. Those on Bella's side are protected when Bella's shield disables the Volturi's offensive fighters, Alec and Jane. Aro, Caius and Marcus decide to vote on whether or not Renesmee will be a danger to the vampire world when she attains maturity. Just before Aro can cast his deciding vote, Alice and Jasper return with another half-human, half-vampire from South America who is about one hundred fifty years-old. He and his three half-sisters (who are also half-vampire, half-human) are the children of a vampire who is creating a "super race." They have never caused any danger to the vampire world. Facing no other choice, Aro chooses to give up the fight, and the Volturi flee.