Council Ascendant Archons not playing their special animation

[Vanden]

When Council Ascendant Archons get to low health, they put up a shield that makes them untouchable and drastically increases their regeneration for a few seconds. This is supposed to be accompanied by a special animation where they cross their arms in front of them and a shield with the Council logo unfolds in front of them; that animation is not playing. Instead, they simply stand in the normal combat idle stance.