My friends and I always fought the Templar by standing off to the right (when you face the arena) and burning down the Oracles of quickly as possible. We have had much better results than all these other lame ways of fighting him. For the most part, we fight Atheon straight up., too. Pushing him off the edge is definitely easy, but it's not nearly as fun. We only did that once a: to figure out if it was possible, and b: because we were short on time. Not our preferred way to play the game by any means.