I don't know if it was intentional, but the small triangular hole along the wall opposite to the big door in the Lorathi arena is so deep that the player character can't get out if falls into it.
(https://img.atwiki.jp/awoiafwb/attach/1/201/lorath_hole1a.jpg)
- How to reproduce it/when/why it happens:
Visit "Lorath", "Visit the training grounds", start melee (crowd) fight. Walk to the point farthest from the big door, search for the hole nearby (one of 2 holes), and dive into it.
- Game version (and steam or downloaded):
AWoIaF v9.3, v8.2. Warband v1.174 downloaded