After several minutes of rest, the group was ready to move on.  As they ascended the stairs, it was observed that the whole building was apparently ready to collapse if given the right amount of pressure, with debris, glass, and other bits and pieces lying around, the four had to be careful not to fall over anything and risk injury.
Ville thought it was lucky that no one else had been taken.  His mind burned with the desire to seek revenge on the kidnapping of Jonna and Gas, and he hoped that no one else would be taken.
“Stay close,” he muttered.
Burton had nearly recovered, despite the occasional cough and wheeze.  Bruises had begun to appear on his neck, where the zombie had nearly strangled him.
As they entered the room, the first thing they noticed was a painted rose on the ceiling, not three feet above them.
“Under the Rose,” Linde noted, and the putrid smell filled the air again, and this time they held their breath or breathed through their mouths.  No one felt the need to vomit.
When the zombies filed in, Ville was ready.  He wasn’t going to let anyone else get hurt, or allow the zombies time to snatch someone else.

“I dream of the winter in my heart turning to spring
While the ice gives way under my feet
And so I drown with the sun.”

As Ville began to sing the chorus the first time through, he became aware of a burning in his lungs.  A zombie had snatched him around the throat and was suffocating him.
With Ville unable to speak, Burton took up the song in his place:

“I've been burning in water and drowning in flame
To prove you wrong and scare you away
I admit my defeat and want back home
In your heart under the rose.

“I open my eyes with a sigh of relief
As the warmth of summer's sunlight dances around me
And I see you with dead leaves in your hands

“I've been burning in water and drowning in flame
To prove you wrong and scare you away
I admit my defeat and want back home
In your heart under the rose.”

Burton was able to get as far as the first repeat of the chorus before he was seized too, and Linde took it up in his place, trying to get it over with as fast as possible, since Ville had long become limp and Burton was turning pale again.
As he finished the song, a burst of light erupted from the floor, similar to the first room, demolishing the zombies and freeing Ville and Burton, Ville falling, unconscious, to the ground, and Burton almost motionless except for his heavy breathing.  Hopefully he wouldn’t have to endure that again.

Linde and Migé dragged their wounded companions to a lean-to already built, possibly from falling debris, and did their best to revive them.  If they were going to rescue Jonna and Gas, they needed everyone’s help.