In turf war, the brutal Zetas bring their horrific methods to areas accustomed to the more businesslike Sinaloa cartel, deepening fear and uncertainty.CULIACAN, Mexico — The cartel henchman nicknamed "El Loco" was reported behind the latest atrocity in Mexico's ever-more-depraved drug war: mutilating 49 people and piling their bodies — heads, hands and feet missing — by the side of a road leading to the U.S.