Duo would really like to throw his hands up in the air and swear a lot, but that would attract more attention than he wants.

"This plan is already not going smooth. We were just supposed to have a few hours of fun before I caught the red-eye back home!"

Insert more stifled gesticulating here.

"River, I know you're awesome. But this is my world! I brought you here, and I'm responsible for getting you back safe!"