There is a bug when rolling up or down stairs in first person with weapons out so you can hold down the roll button to keep going. Unfortunately it does not happen all the time. What does happen (when it occurs) is that your character is unable to move in first person (works when you switch to third) and you can hear them making the roll breathing noise. During this your stamina is perpetually going down for each "roll" that happens.


EDIT: Not game breaking i know just annoying and thought i'd report it.