PhalanxCO on 22 November 2011
What about the one on the bridge in the room on the east side of the main hall (the one that fills with water when you hit the switches in the side rooms)? I never managed to get either of them on the ground and just had to whack at them until I hit their soft spot enough times.
EDIT: I just found a video walkthrough and figured out what I was doing wrong.
