The duel.zip file you have requested: Media / Videos and Trailers / Thief 'Duel' Trailer - 1.48mb is not available. Perhaps try browsing all files for the game Thief and upload any files you want to share or are missing. This is the only information we could locate:
A nice in-game clip showing Garret fencing with a guard. This very old movie also displays an earlyer draft of the Thief interface.