So Mace Windu backed up by Agen Kolar, Saesee Tinn, and Kit Fisto have arrived at Palpatine's office, intending to place the Chancellor under arrest. But when they arrive, they find not Palpatine waiting for them, but a different Sith Emperor. A figure cloaked in black robes with a hood pulled up over his face. Mace assumes him to be Palpatine, and calls out: "In the name of the Galactic Senate of the Republic...you're under arrest Chancellor"
The cloaked figure rises, and Mace sees how his eyes are as black as a void.
"I will destroy you all"
And with that the battle begins. Who wins?