In real life this tends to happen in reverse (climbing a mountain rather than descending), since it's generally easier to go up than go down.
Reading accident reports, a common theme is people setting on what they think is a class 3 or 4 hike, getting lost and ending up on a class 5 technical climb. With a gradual transition from class 4 scrambling to class 5 slab (less than vertical) climbing you can very quickly get to a place where it would be dangerous to descend.
Reading accident reports, a common theme is people setting on what they think is a class 3 or 4 hike, getting lost and ending up on a class 5 technical climb. With a gradual transition from class 4 scrambling to class 5 slab (less than vertical) climbing you can very quickly get to a place where it would be dangerous to descend.