The above in Shae’s words:
The concept above was done for HALO 4. It was some work for a portion of a level that was ultimately scaled down so the team could execute it within time limits. Along the course of this experience, one would encounter a series of banshees in water that was knee deep while fighting a variety of other foes.
So now I’m curious which level this was to be? There are a few places I can think of that this could have been added.