Here is how it would go down...
Dooku: Hello Ladies. My suggestion is that you lay your lightsa...
Serra: Cut the crap, old man. You need to die.
Dooku: I think not, Padawan.
Serra: I'm no padawan.
Dooku: I am talking of your skill, my lady.
Aayla: LOOK AT MY BOOBS!
Dooku: Indeed they are nice. Too bad you must die.
Aayla: PIE? I MUST EAT PIE?
Dooku: Right....
Shaak Ti: Count, normally you would be taken into civil arrest, but you have done far too much damage to the Jedi and the republic.
Dooku: I wont let you win like i let Anakin win in episode three.
Aayla: EPISODE PEE?
Dooku: Quiet down, blue one. Let us get this over with, i have business to attend to.
Dooku ignites saber and begins saber fighting with the three ladies. Saber scrambling goes on for fifteen minutes until suddenly, Dooku takes Aaylas arm off and then slashes her torso, killing her.
Shaak Ti: Aayla!!!
Dooku: I found her skill pathetically shoddy. Let us continue.
Serra strikes a massive land on Dookus saber, knocking him away. Dooku gets up and force pulls Shaak Ti onto his saber. Dooku unignites it.
Serra: Oh god...
Dooku: I could always let you walk away... That would be no fun at all.
Serra: That's it!
Serra flies towards Dooku, swinging her sabers wildly. Dooku catches her with a downwards right slash and takes her hand off. Serra falls to the ground and Dooku stabs her in her abdomen, killing her instantly.
Dooku: Bah, i have fought tougher younglings.