Thanks for downloading our quick adventure. You can run it by itself or attached to something else goign on for your players.
We have somee clarifications:
If you duck into an alcove, all of the minuses for dodging rocks are removed. You're taking a breather.
Optional: You could add +1 to your dodge roll for Medium rocks and a +2 for Small Rocks. In testing we found it makes it easier to survive, but takes away from the strategy.