Under pressure from both Cabeza and Portuguese representative Hontar, Cardinal Altamirano is forced to choose between two evils. If he rules in favour of the colonists, the indigenous peoples will become enslaved; if he rules in favour of the missions, the entire Jesuit Order may be condemned by the Portuguese and the European Catholic Church could fracture. Altamirano visits the missions and is amazed at their industry and success, both in converting the Indians and, in some cases, economically. At Father Gabriel's mission of San Carlos, he tries to explain the reasons behind closing the missions and instructs the Guaraní that they must leave, because "it is God's will." The Guaraní question the validity of his claim and argue God's will was to settle and develop the mission. Father Gabriel and Mendoza, under threat of excommunication, state their intention to defend the mission alongside the Guaraní if the plantation owners and colonists attack. They are, however, divided on how to do this, and they debate how to respond to the impending military attack. Father Gabriel believes that violence is a direct crime against God. Mendoza, however, decides to break his vows by militarily defending the Mission. Against Father Gabriel's wishes, he teaches the natives the European art of war and, once more, takes up his sword.