Fionna glanced at Francoeur, then Odo and then back at their, apparently, captors.

"Wait, wait, no no no, that's crazy. You can't just pull us down here and say we have to stay here, that's, you know, totally ignoring what we think about anything. Now, I can totes talk with you guys, laugh, talk about your religion and all that jazz, but stay here? Forever? What?! Come on!"

They were joking, right? Again, she looks at her fellow captured.