On certain doorways, using your roll ability and entering into the next room mid-roll sometimes causes the player to take fall damage; most notably marked at the main entrance of Soggy Cave where nearly 75% of the player's HP is nuked upon entering the area in this fashion.

However, this interaction does not seem to work when entering through the doors vice-versa. The player simply passes through to the next area without taking any notable signs of damage upon moving in an inverse manner.

From the above statement, I believe it can be assumed that the fall damage arises from differing height levels of the two connected areas - this would explain why the player does not take fall damage when trying to replicate this maneuver in reverse.

This bug has been observed to work using both the standard roll and the Light Feather artifact.