The famous duel was staged by Hollywood fencing master Fred Cavens. Cavens specialized in staging duels that relied more on actual swordplay rather than the jumping on furniture and leaping from balconies that many film “duels” consisted of up until that point. Cavens’ son, Albert Cavens, doubled for Tyrone Power in the fancier parts of the duel (mostly with his back to camera), such as the extended exchange with Esteban ending with Don Diego’s sword smashing into the bookcase. Basil Rathbone, a champion fencer in real life, did not care for the saber (the weapon of choice in this film), but nevertheless did all of his own fencing. Fast fencing shots were undercranked to 18 or 20 frames per second (as opposed to the standard 24fps) and all the sound effects were post-synchronized.