It almost seems like Lucas only had one or two takes on most of the dialogue in the film. Maybe once for rehersal, a second time, and then a third time to make sure that they said all the words in the script. I don't think that any emphasis was placed on HOW the words were spoken.
GL: "Okay, twirl your saber! Good! Now look to your left, look to your right! Now pause, good, walk forward. Cut! Okay, good, that was good."
HC: "Uhh, what exactly were we filming?"
GL: "Oh this was on mustifar when you see Obi-Wan coming at you."
HC: " 'Kay... so what was I supposed to be doing? Was I angry? Determined? Planning my attack? What?"
GL: "You were about to engage in the fight. You were fine, we'll fix it in editing if there are any problems."