Game Mechanics: Warping when fleeing

[Brut]

Multiple instances so far (while fear kiting dwarves in BB) the mobs start warping few steps backwards / sideways over and over. Like they're fleeing normally, then suddenly it warps couple feet to side, takes a few steps there the same direction as it was going, then warps again, repeat like up to 4-5 times. Might have something to do with them roaming on a cliffside? Altho think I saw it go backwards on a flat surface too, but it was sort of inside a tree at that point.

Sorta hard to dictate where they're gonna go to get extensive research results. Do chime in if anyone else seen this!

EDIT: Aight seen it on flat surface too. It was trying to go forward (like kept walking normally forward), but kept warping to the side heading way more that way. Weird weird.