After the drop down into the arena of Temple of Shadows.
If you stand on the skull pile, hug the wall of the drop down below the wooden bridge, and walk off the skull pile, you will fall and be hanging off the bridge before the drop down.
If you hang long enough on the bridge, you won’t fall off the map and die but will be placed inside the wall right of the dropdown and will not be able to get out.
Steps to reproduce:
- Stand on the skull pile
- Hug the wall
- Walk off the skull pile while hugging the wall and magically start hanging out on the bridge :).
Video: