Sad to say I don't have a vid but...
In phase 5 I was just distinguishing some fire and Vanaduke aggro'd towards me. I merely died due to that I only had 1 remedy capsule the whole fight, but luckily I lurched Vanaduke makin the fight easier. Although it gets better. I actually TRAPPED him while he was charging towards me so, he couldn't turn or Nything, meaning no Slag Guards. None. No zombies either. So my party members, (Sketti, Slickviper, Wingedflame) just stayed at the bottom gunning him...
In my opinion, best Vanaduke fight since Patch.
That happened to me just ONCE... until the VERY VERY END... he spawned the Slag Guards... but only one round of them and before they could do much we killed Vana :D
(I don't have a video...not sure if someone recorded it... lol)
but yea it happens XD