The central twist of "A Fistful of Dollars" is the Stranger's masterful manipulation of both the Rojo and Baxter families. He is not loyal to either side; his allegiance is solely to himself and his pursuit of money. A key plot point is his decision to help Marisol and her family escape from the clutches of Ramón Rojo. He creates a diversion, making it appear as though the Baxters were responsible for her rescue, which incites the Rojos to launch a full-scale, bloody assault on the Baxters, wiping them out.
After being brutally beaten by the Rojos for his betrayal, the Stranger escapes with the help of the coffin-maker, Piripero. He recovers in hiding while the Rojos, believing him to be an ally of the Baxters, torture the bartender Silvanito to find him. The film's climax reveals the Stranger's cleverest trick. He returns for a final showdown with Ramón, wearing a makeshift steel chest plate under his poncho. Ramón repeatedly shoots him in the chest to no effect. This apparent invulnerability unnerves Ramón and his men, allowing the Stranger to pick them off before facing Ramón in a quick-draw duel, which the Stranger handily wins. Having eliminated both families, he leaves the now-peaceful town, his job done, without taking any of the families' money, reinforcing his enigmatic nature.