Hriston
Dungeon Master of Middle-earth (He/him)
I think clearly setting the stakes before the roll would have improved the gameplay experience here. You mentioned that the wall was DC 10 to climb, but I think it was unclear to the player what success and failure on that check would look like. Making that explicit before the roll, including whether degrees of success are in play, would help avoid a mismatch in expectations about how a 20 should be interpreted, for example.