How did Grievous do anything of not in this episode? He was a complete clown. He badly managed an initial invasion and got beaten in a duel. When he was lucky enough to see the enemy commander wounded and retreat, he decides to start fighting random enemy foot soldiers. You know, rather than actually leading his own troops. Which, as a general one would think might be important. Nor was there any indication that he would ever have done anything different, were it not for Dooku's command. At that point, he simply repeats Dooku's orders to his army. He was only moderately more useful in combat than any other member of his droid army, and had no more strategic value than a commlink. Not sure I agree. To be clear, your overall point is well taken. But they lingered on the shot of the decoy dying an awfully long time for someone whom we had only been introduced to a few second before. That, along with the reaction shots to Padme, don't really drive home that the Queen's life is in danger so much as it does seem like an attempt at arm twisting us into sympathy for a total stranger.