Fairly simple one…
If you maneuver Heorot to the middle left of his arena, he gets stuck and no longer does his sprint with his circular cold vortex. His summons also seem to only attack you from a small entry point - i.e. they are funnelled in one by one. On subsequent testing, while stuck in the same place, Heorot also seems to be unable to attack with any attack for extended periods (almost like when Rahyeh gets stuck sometimes). He eventually does “wake up” but its noticeable.
Done the usual verify games files etc… and issue was repeatable using a Bladedancer Flurry build.
Image below shows the rough area where he died.
