That is what you means as far as it seeming like he's giving up rather quickly. As he speaks, most of the camera work is on Chireadan, who goes to actually look whether they are dead. Chireadan stands in front of the window. At the end of his speaking part, the camera is back on Jaskier for the punchline.

"He always said I had the most wonderful singing voice."

And that’s the jokey joke. It references the b plot of Geralt feeling bad that he called Jaskier’s voice a ‘pie with no filling’. When Jaskier is hurt, Geralt says that he doesn’t want that to be the last thing Jaskier remembers.

Clearly, that would not be the last thing Jaskier remembers, because he will just change it to suit himself. It's a little of the ol’ Dandelion impenetrable ego performance.

And that is the 'piercing' of the dramatic moment you referenced.

But then Chireadan comes back.

"They're alive."

And Jaskier is like...

"Bollocks."

They go look in the window together, and see them having sex. Chireadan pulls Jaskier away.

The Last Wish

In the books, it's quite a different set up. 

Dandelion is with the Mayor (Neville) and Priest of Rinde (Krepp), while Geralt fights with Yen in the building. 

The reason for this reflects what I think is the biggest difference between the two stories-Yen.

Much like in the show, Yen did send Geralt to beat up the townspeople who are against her. (the tone is quite different, and the show doesn’t show it, but the basics are the same)

However, Yen does not want Geralt to get into legal trouble on her account, so she sends Dandelion back through a portal, and asks him to use his last wish to help Geralt.

Dandelion drops back through the portal.

“Innocent!” yelled the poet in a clear melodious tenor, sitting on the floor and looking around, his eyes vague. “Innocent! The witcher is innocent! I wish you to believe it!”

So now Dandelion is with the mayor and the priest, and Geralt goes to help Yen against Dandelion’s advice. Like in the show, Dandelion advises against it.

“Geralt,” said Dandelion, ‘you’ve gone stark raving mad! Keep away from that bloody strangler!”

And look, he has a point. He’s basically like, she is choosing this. She wants to do this. She used us both against our will. She is powerful and terrifying (the subtext being, why would she need you. If she’s dead set on this shit, then let her do it)

But of course Geralt goes. He is already falling for Yen. I think in the books it’s more clear as to why. But that’s sort of beside the point of this post. (At some point I want to do a compare/contrast Yenralt.) 

But anywho. In the books, Dandelion is with the mayor, the priest, and Chireadan and they are watching the building from a safe distance.

Dandelion is distraught.

“What’s happening there!” Dandelion, clinging to the wall, strained his neck, trying to see in the downpour. “Tell me what is happening there, damnit!”

Then as the house begins to fall, 

“Why did Geralt have to go in there?” groaned Dandelion. What the hell for? Why did he insist on saving that witch? Why? Chireadan, do you understand?”

Of course, Chireadan is in love with Yen, so he understand perfectly.

Then, Dandelion is terrified Geralt will die. He is upset, he is wailing.

“Are they both going to die?” wailed Dandelion. “How come, Krepp why? After all, the witcher--Why by all perfidious and unexpected plagues, isn’t he escaping? Why? What’s keeping him? Why doesn’t he leave the bloody witch to her fate and run away? It’s senseless...It’s suicide. And plain idiocy!”

The mayor is not so distraught.

“It’s his job, after all,” interrupted Neville. “The witcher is saving my town...if he chases the demon away, I’ll reward him handsomely...”

Then Dandelion cuts him off. 

Dandelion snatched the hat decorated with the heron feather from his head, spat into it, threw it in the mud and trampled it, spitting out words in various languages as he did.

Now, I believe that spitting in one’s hat is considered something for good luck, and in some cultures is meant to ward off evil spirits. Dandelion looks down on superstition as is quite explicitly atheist, yet he resorts to it the minute he’s desperate on Geralt’s behalf.

(If I am reading that correctly. It could also be an expression of antipathy for Neville for all I know. Maybe someone else can comment, I'm just guessing)

And then Dandelion realizes something. They explained to him that Geralt actually has the wishes, but then it dawns on him that Geralt could use it to save himself.

“But he’s...” he groaned suddenly, “still got one wish in reserve. He could save both her, and himself! Mr. Krepp!”

The priest explains how difficult that would be. Then the house ‘explodes’ and the djinn escapes. The mayor and the owner of the house rejoice. The owner of the house has previously said that he has good insurance, so he says ‘what a wonderful ruin’. Dandelion is not so happy. In fact he is distraught, understandably. He sees that the house has fallen and he is afraid they are dead.

“Dammit, dammit!” hollered Dandelion...”it’s shattered the entire house! Nobody could survive that! Nobody I tell you!”

The mayor jumps straight to the same conclusion, but it significantly happier about it.

The witcher, Geralt of Rivia, has sacrificed himself for the town,” mayor Nevills said ceremoniously. “We won’t forget him. We’ll revere him. We’ll think of a statue...”

Dandelion does not react well to this. This is the part you were referencing.

Dandelion shook a piece of wicker matting bound with clay from his shoulder, brushed his jerkin free of lumps of rain-dampened plaster, looked at the mayor and, in a few well-chosen words, expressed his opinion about sacrifice, reverence, memory, and all the statues in the world.

I kind of wish the book had spelled out exactly what he said because I think it would have been amazing. But Dandelion tears him a new asshole and tells him where he can put the statue. We just don't get to hear the exact words.

Then it grows quiet. Dandelion is still afraid they are dead, but decides to go look to make sure.

By all the gods,” muttered Dandelion, “what silence...they’re dead I tell you. Either they’ve killed each other, or my djinn’s finished them off.”

Notice he still calls it 'my djinn', I think because he found it. He clearly is ready to blame himself. But then they go take a look at the ruins. They start to hear noises.

“Yennefer’s alive,” said Dandelion suddenly, straining his musical ear. “I heard her moan. There, she moaned again.”

And like in the show, Chireadan looks through a broken window, seeing Geralt and Yen having sex.

“Let’s get out of here,” he said quietly. “Let’s not disturb them.” 

Chireadan is heartbroken, because he loves Yen.

Of course Dandelion is curious and doesn’t want to be put off (as always).

“What are they doing,” Dandelion was curious. “Tell me damnit!” The elf smiled very, very sadly. “I don’t like grand words,” he said. “And it is impossible to give it a name without using grand words.”

I think because of the involvement of the mayor, showing the way they see the witcher (useful, but highly expendable) next to Dandelion (that’s my friend, motherfucker) is interesting. I like that Dandelion tears him a new one.

The moment is definitely moved past much more quickly in the show, though to be fair they have a lot less time.