Thralls dont have good AI isnt fault of a player If a Thrall fall out in sinkhole or Any others hight place and yes They shall be imune to fall damage and lava damage SINCE he cant copy your moviments he Just follow like a blind man walkingin EVERY shit and calling in every place.

If Thralls Begin to die to fall damage funcom Will lose more and more players and the game right now IS almost empty Because They chooses and bugs.