We all know the area.
That one spot where the two yellow minotaurs spawn?
Yea I was there and I heard what sounded like that weird noise thrall make. Like a clicky and clacky.
But no thrall spawn in that area...
I then went looking for these thrall and only found a spot on the ground right under the large bridge like structure that my radar was indicating that an enemy was below me.
I heard the sounds but couldn't find them... Kinda freaked me out so I left the area..
Sounds were really creepy with turtle beaches
-
It's somewhat common in games for enemies to spawn in out-of-bounds areas. Something probably got stuck under the floor. Still, might be worth investigating. I'm currently exploring the enemy spawner rooms, I saw a chest appear in the back of one of them in what I always thought to be an unreachable area, and found out you can get there jumping and crouching through the cracks.