Even when you spar for real and fight with full contact in training, you get hurt or you hurt someone and you see them trying to fight back. I want to inject as much reality as possible into fight scenes, even if some of the moves are slightly larger than life, if the emotion is there you'll then still be able to buy it. I recall seeing some films where people perform an acrobatic flip mid-fight and land with graceful precision and it's almost like watching Zorro... it's almost whimsical but you're no longer engaged.