The fifth episode of Ahsoka, "Shadow Warrior," saw Ahsoka reunited with her master, Anakin Skywalker. Ahsoka found herself back in the World Between Worlds after seemingly being killed by Baylan Skoll and was greeted by her old master. The reunion was not an easy one, however, as Anakin had one final lesson for his old Padawan, and intended to put her to the test with a trial by lightsaber. Their duel moved from the World Between Worlds into their memories of the Clone Wars and saw Anakin tapping into both the light and dark sides of the Force.
Source：https://www.cbr.com/ahsoka-anakin-return-recalls-darth-vader-duel/
