Thanks for the input Kazilla.

I also considered "When Worlds Collide," but I used "Down with the Sickness" because if you pay attention to a lot of the lyrics it says a lot of stuff like "I can see inside you the sickness is rising" and "There is no turning back now, you've woken up the demon in me" which helps connotes Anikan's fall to the dark side. If I had focused ONLY on the lightsaber duel "When Worlds Collide" would have be perfect. But I keep flashing back between the fight and Anikan's progression to Darth Vadar. Plus a lot of things in the song are timed with things in the video, so using a different song would mean a complete overhaul and a totally different music video - only with the same theme.