Online official
Bug
PvE-Conflict
North America
Any guard thrall will eventually get displaced from its currently assumed position sooner or later after attacking or trying to attack a target. I have witnessed the displacement happen horizontally on even level and vertically downward. I have not seen it happen upwards.
Once displaced, the thrall assumes this new location as its new guard post and operates from there. It can ignore several structure pieces when “teleporting” that way.
A few of my thralls went from the top level inside of my house, which is completely enclosed, through 2 ceilings and 2 walls 4 tiles downward and 2-3 tiles outward.
This happens more often in archers thralls, probably because of their constant backpedaling.
The most extreme cases of displacement was on 2 melee guards though. I found one about 150m away from its original post fighting mammoths. The other was about 80m away from its post fighting rotbranch.
In both cases monsters with knockdown effect were involved. I assume that the knockdown breaks their way back home to their original guard post.
The ONLY way I have found yet to stop this from happening is setting thralls on passive. No other behavior combination works, none.