Consequence of Taking Too Long (Trailblazer's Bounty)

[windyridge]

New GM here running Trailblazer's Bounty in PBP not using it as a Pathfinder adventure per se, just a stand alone. Only one PC of the 4 passed an athletics check to move stones to make fording the river easier. What kinds of consequences should happen? I want there to be some kind of result so that the rolls actually had meaning. Since I am not awarding Discovery points I am not sure what to do.

They are the Mountain Forest Low section page 7 after defeating the ravens.