In one of the most famous scenes of Star Wars, Luke Skywalker must use all of the things

In one of the most famous scenes of Star Wars, Luke Skywalker must use all of the things he learned from Yoda about “the force” in order to face his enemy Darth Vader. During this confrontation, Skywalker and Vader have a long verbal argument that turns into a light saber duel and eventually culminates with a serious injury.
In the example above, identify EITHER an internal conflict (human vs. self) OR an external conflict (refer to 3 types on previous page).
Explain the conflict in a short answer response in 1-2 sentences.