That's probably how horses work. Orion saw a horse once.

There is too much singing for him to be expected to pay attention to the dialogue. Something about a horse. Tomonori is starting to think that they might not be doing a very good job of performing this play. Unless that's the point. He should really ask Nie Huaisang to explain again about plays.

"Wow! The horse has taken me off to this spooky mysterious castle! I wonder what's in here."

He is making music with Wei Ying and he is the happiest person in the world.

The stick-in-the-mud is fun to play with.

"Wow. There doesn't seem to be anyone in this castle."

Hint? What's a hint? He can't hear any hints because those aren't playing the dizi.

Head empty only Wei Ying.

"I wonder if there are any MAGIC PEOPLE in this castle, like as a completely hypothetical example a MAGIC TALKING CANDLESTICK."

Oh! Oh right!

He drops his dizi mid-refrain and scrambles to grab the candlesticks. 

"A girl! There's a girl in the castle! She's here to break the spell!"

Wei Wuxian is very good at music and less good at picking up cues.

... It's cute.

Now Huaisang was cast well, seeing as he's carrying the whole show.

"Is anyone here? I'm looking for my father."

"I, your father Maurice, am here in this dungeon."

"Who put you in a dungeon, Father?"

"Run away."

Lurk lurk lurk in the background.

"Who's there?"

"The master of the castle."

"It's your fault my father is here. Let him go!"

"You can't boss me around! I'm in charge here!"

(The attempt at intimidation would probably be more effective if Jiang Cheng weren't a solid eight inches shorter than Nie Huaisang.)

"Well, you put old men in dungeons where they might die, so I'm pretty comfortable in saying that I'm better at ethics here!"

"I don't care about ethics! If someone comes here to laugh at me they're going to be in prison forever! He's lucky I didn't kill him."

"Take me instead."

"What."