Based on the preview, I think I know what the Roadblock is.
They have to perform in the show, then swim underwater and look for a clue among the fish.
The question is: Why would T/K and J/D cry or potentially struggle if it were that easy?
My hypothesis is that the task is timed lmao. Everyone only has limited time.
The editing of the sneak peek and the fact that all three teams are together REALLY implies that the RB is before the Detour IMO.
A lot can still happen, but I'm hoping for the best *sighs*
The water RB looks really cool!