Finn, after taking up Papyrus on the offer for a ride (because why not), is paying rapt attention to how the skeleton was mixing his chemicals. He was an alchemist, too, after all. Still, some things were still a bit above him in the Job.

"Nerd," Valli whispered at him. He responded with an elbow to her side.

Like children, honestly.

But he also took out his gun in case something was waiting on the other side.