Sensuki
Arcane
Yeah Chilloutman on the Obs forums (who I PM'd after he had a go at me in the thread, problem now solved) said the same thing after I showed him the video as well. I'm not so sure about that though and here is what I said in response
If the AI pathfinds around Engagement zones, you can still proc easy disengagement attacks by slightly moving your character when the AI is near, all you would have to do is shuffle forward a tiny bit and suddenly the enemy AI would be in your engagement zone. This would force them to attack the first enemy that engaged them, however since Engagement radius is a circle around the character, circles can overlap, and enemies would proc disengagement attacks from nearby characters and possibly from the engager if they had to move to get in range. This would also create issues with pathfinding, because if enemies were programmed to avoid engagement zones, it would be very very time consuming to code a solution that allows them to smartly decide when to move through engagement zones and when not to - which would make them get stuck, and also allow the player to make enemies get stuck and completely block off pathways in narrow spaces.
I could just move a character left and right across a narrow hallway, and if the enemy AI was trying to decide whether to run through my engagement circle or to avoid it they would probably stutter on the spot because they would be constantly reevaluating against the change in conditions.