When Alma the Younger was in a way contrary to God, it took and angel to move him from his course, and the action of the angel did not come of Alma's own volition. Alma did not call for assistance of God to change. Zeezrom, on the other hand, has recognized his position, and recognized also that Alma and Amulek hold the power to "cure" him. While he may have been scorched with a fever, it was the fever of the soul that he desired to be cured.