I was playing (Hyde) vs a Wraith (it was a person, not AI) the other night and somehow started floating - I believe it was after I got hit by her. I couldn’t control any vertical direction but I kept floating upward slowly. I was able to run around like normal and hit the monster, however. They eventually did the grab move and brought me down, but after I was released, I was still floating around. I don’t recall the name of the map, but it was the one that was introduced during the final Beta, but was not in the two Alphas.
I’ve not seen anyone else mention this so I thought I would.