Yes it would all depend on where her pack was on her body when she fell. I had the same thoughts about the ass somehow lessening the impact of the fall. It would be fun to have her realize some of them were broken, maybe not right away. Maybe after they get out of there, since her pack isn't really a priority right now. 

I don't really know how to get started with my post though. We are in a dark abyss where you can't see your own hand in front of your face. Kind of hard to do anything.