Inside the Final Duel: Maul Vs. Ahsoka
https://www.youtube.com/watch?v=-k5lHp6g77s - from the official Star Wars YouTube channel (4:20 mins long).
The blurb:
“Dave Filoni, executive producer and supervising director of Star Wars: The Clone Wars, along with cast and crew, discuss the making of Maul and Ahsoka Tano’s climactic battle on Mandalore.”