Cast Mage hand to hit a lever over sewer water. Find out that the flight mechanic can't fly over water due to no path. Last time I checked flight has nothing to do with ground movement yet for some reason Larian decided not to rise to the challenge of making flight work the way that it should! Like flying over obstacles, water and move in the vertical axis as well. To me this is being lazy of Larian. I'm a game designer, if I was hired and worked for Larian, this would have been pushed through to work the way it should. Not tied to ground movement.. almost ruins the game experience due to little things like this.
