 Estol's 1946 book on the Argentinian boxer Luis Ángel Firpo was the subject of the 1949 movie "Diez segundos" (Ten Seconds), directed by Alejandro Wehner.The climax comes with the fight in New York on 14 September 1923 between Firpo, called "The Wild Bull of the Pampas", with Jack Dempsey.Estol claimed that when Dempsey fell out of the ring he took more than ten seconds to climb back, thus losing the fight.