Can I ask, why does it make any more logical sense that Anakin would suspect that Dooku would want, specifically, to kill Padme after her fall, than the possibility of him rushing Dooku in the duel (unless you have completely irradicated his earlier impetuousness)? Have you considered just before the duel begins, cutting to Padme’s lifeless body on the sand (with a little sombre music) and then cutting back to Anakin (perhaps with a close-up on his face so everyone knows what he is thinking) who then rushes in? Would that not give him the excuse to play the hero without having to add any ‘heartfelt’ dialogue?
Good luck and happy Editing!