"I can walk you through the castle on the way to lightsabers."

She does. It's a castley castle; it has all the modern Martian conveniences but tucked away or in the form of silver robot dragons.

High towers! Deep dungeons! Courtyards! Crenellations!

“Have you got a throne room?”

"I could furnish the entryway that way but I haven't."

“Secret passages? Bedrooms fit for enchanted sleepers and foolish young princes?”

"I do have secret passages but I do not show them to people because they are secret. Guest rooms are totally available. And here's where I keep the lightsabers."

And the rest of her extensive armory, but what she grabs is lightsaber hilts. "Grabs" meaning "holds out her hand towards". One slaps into her palm.

He acquires his own similarly.

“But will you choose to yield your secrets — or your life?”, he exaggeratedly growls.

And then adds in a normal voice, “Though I have no idea what I'm doing here, I should point out.”

"That's fine. I do, and if you do manage to hit your head or something you'll be okay. Sabers themselves are safe."

She lights hers up. It doesn't sound very safe. It looks golden and deadly.

He lights his and makes a vaguely recognizable attempt at a suitable stance!

And she slashes at him. She's good at footwork.

Aaaaablock?

She'll allow it. Tries again.

He can at least repeat with variations things that seem to work.

She adjusts to his skill and never lands a hit, but manages to move around a lot in the process and make the fight look really impressive.

“I am reminded! That you said combat dance is a thing! That you do!” He attempts to pretend to attempt to cut both her legs off with one risky swipe.

She jumps. "I do! It's tons of fun!"

Chaaarge at landing point.

“And evidently! The skills transfer to non-scripted situations!”

"Combat dances are outlined, not choreographed!" Block. Flip. "It's like professional wrestling only in more media!"

Fall down scramble up resume. “In more media?”

"I don't wrestle! I mostly swordfight. Sometimes I do pretend magic."

“Aw, nobody's figured out actual magic yet?” Jokingly.

"Naw, Sing can't break the laws of physics and didn't even find any really cheaty exploits, if you break open antigrav stuff it's still nifty but it works on the same math."

“So what's the ending condition for this game?”

"If you're done you leave me an opening and I win. Or you signal me somehow and I leave you one."

“But how do you tell the difference—” block! “—between a mistake and an opening on purpose?”

"Usually with these things there's an underlying plot of some kind."