When lookind at the ground in that puzzle, not on all areas, only on the lower one i have the img attached, you see that bright area, covering most of the ground, that was only a part of it on the img, i think it was near Nicholas Throckmort NPC
In the first area, in the mission about defending some chest areas, the bounds seems to be walking with half of body underground and had some lag in his movement around the stairs I had posted in the picture, also an enemy appeared inside the stairs.