I’m not sure Mark’s logic in panel 1 is accurate. Whole chains of people certain can get washed away, depending on the circumstances. But it’s a good group psychological trick to minimize panic. And it is a shame that Jules Rivera again undercuts the drama and value of Mark’s advice by indulging in buffoonery in panels 2 and 3. A flash flood is a dangerous situation, a guaranteed bit of drama and suspense, made to order. So why piss on it?

This confusion is further exacerbated by a contradiction between the dialog and the imagery in the panels. That is, the dialog follows a chronological sequence, but the images definitely do not. Let me demonstrate (ignore the dialog for the moment):

Panel 1: Everybody climbs the hill as their campsite is flooded and washed away.
Panels 2 and 3: Jess and Venus stand around, not linked arm-in-arm or climbing, while they joke.
Panel 4: The entire crew stands around their campsite at the bottom of the hill.

Now, consider the dialog once again. Logic indicates a more accurate sequence of panels should be P4>P2>P3>P1. We’d have to change the message box in panel 4 to something more applicable: “The group agrees to bug out!”  Like so:

I think the revised sequence builds drama with Mark’s warning coming at the end.