I built a few towers next to each other. Every tower has cauldron which alternates like: Tar Cauldron, Burning Cauldron, Tar Cauldron, Burning Cauldron, etc. I have assigned a thrall to each of cauldron. According to the logic, thralls should use cauldron once enemy come close under the cauldron, but the problem is that they don’t. Some of them use it 1-2 times per purge, some of them don’t use it at all. They just get to the battle stance, stay still and look down on enemies. This really pissed me off. I even tried to adjust the attack distance in their options - doesn’t help. I also checked, that all cauldrons have tar and none of them overlap each other.
Should I assign only specific thralls for this job? How far apart the cauldrons should be placed? Is it just broken as many other things in this game?