Demonstration is in the video:
it not even necessary to cheese it, a humble build, and a well trained thrall was all we need, i had some fun on it. The only risk moment was the zombies because the thrall get a little lost and zombies can lock you.

i ddint get how you managed to trigger the event. Did not you moved down and fired an arrow then moved back to the corridor in inside?. On SP i flyed back to the corridor to see what would happen and suddanelly died.
Thank you for this video. I’ve passed it over to the rest of the team for further investigation.