Sidious leaped toward Anakin, both blades thrust forward. The Jedi Knight parried the Sith Lord's attack and spun to deliver his own blow. Sidious caught Anakin's lightsaber between the crossed blades of his own and slid them forward. He swung his lightsabers out and around to strike at Anakin's midsection. The Jedi flipped up and over the Dark Lord just in time to evade. Another attack from Sidious nearly found its mark, but Anakin stopped the energy blades with his own. For a moment, the combatants stood, pressing their lightsabers against one another. Sidious snarled as his yellow eyes glowed from the hollow cavities in his disfigured face.
"Your feeble skills are no match for the power of the dark side," the Dark Lord crowed. He and Anakin both leaped backward to face one another from opposite sides of the room.
Sidious sprang on the offensive again, whirling around, his lightsabers swirling in a dazzling blur of motion. Anakin concentrated, trying to time his own strike just right. He skipped his blade off of Sidious's red lightsaber and brought it down through the emitter of Master Windu's. Once again armed with only one weapon, the Sith spun about and thrust at Anakin's chest. A circular strike from Anakin's lightsaber knocked the attack harmlessly aside.
The Sith Lord unleashed another volley of lightning, but Anakin managed to catch it on the blade of his lightsaber. Maintaining the lighting with his left hand, Sidious struck at Anakin with the lightsaber in his right. The Jedi managed to maneuver such that the Sith's blade and lightning were both held at bay.
The Dark Lord let out a snarl and attacked again with his lightsaber. His anger had caused him to attack recklessly, and Anakin saw an opening. With a quick parry to Sidious's lightsaber, and a swift attack of his own, the Jedi Knight severed Sidious's arm, just above the elbow. The old Sith howled in pain and anger and leaped backwards behind his desk. He deactivated his lightsaber, tucked it away in his robes, and then pressed a switch right under the edge of the desk. An alarm began blaring as Sidious jumped over the desk and reactivated his lightsaber.
"You will pay the price for you lack of vision," the Dark Lord said.
Keeping low to the ground, Sidious raced past Anakin, deflecting the Jedi's attacks, and made for the antechamber outside the office. Anakin followed the fleeing Sith, entering the antechamber just in time to see a squad of clones rush in the door. Sidious looked back at Anakin and smiled.
"Execute Order 66," he said before sweeping past the clones and out into the corridor.
Anakin started to follow the Sith Lord, when the clones leveled their blaster rifles at him and opened fire.