Premise: The Grand Duel (Italian: "Il Grande duello"), also known as Storm Rider and The Big Showdown, is a 1972 Spaghetti Western film directed by Giancarlo Santi, who had previously worked as Sergio Leone's assistant director on "The Good, the Bad and the Ugly" and "Once Upon a Time in the West". The film stars Lee Van Cleef as a sheriff who seeks justice for a man accused of murder.
Hypothesis: Sergio Leone taught Giancarlo Santi everything he knew.