Rikke: "Already done, sir."
Tullius: "Ulfric Stormcloak! You are guilty of insurrection, murder of Imperial citizens, the assassination of King Torygg, and high treason against the Empire. It's over."
Galmar: "Not while I'm still breathing, it's not."
Rikke: "Step aside Galmar. We're here to accept Ulfric's surrender."
Ulfric: "I'll never surrender Skyrim into the hands of a corrupt and dying Empire."
Rikke: "Skyrim doesn't belong to you, Ulfric."
Ulfric: "No... But I belong to her."
Tullius: "Enough! You are traitors and will die traitors' deaths. Stand down and face public execution, or advance and face summary execution by my hands. It matters little to me. Either way I'll be sending your heads back to Cyrodiil."
Galmar: "Well? What are we waiting for?"
The three of them will then draw their weapons and engage in combat, with Rikke and Tullius going after Ulfric while Galmar goes after you. When Galmar is dead and Ulfric is kneeling on the floor, Tullius will sheathe his sword and once again prove how little he knows about Nord traditions:
Tullius: "Well Ulfric, you can't escape from me this time. Any last requests before I send you to... to wherever you people go when you die."
Rikke: "Sovngarde... sir."
Tullius: "Right. Well?"
Ulfric: "Let the Dragonborn be the one to do it. It'll make for a better song."
Tullius: "Song or not, I just want it done."