Walk on Air
Air, smoke, and other gases are like solid ground beneath your feet, allowing you to walk up and down "invisible stairs" at your ground Move. This won't work in a vacuum – there has to be some kind of air present. If you get knocked down or slip, you fall! You may attempt one DX roll per second of falling. If you succeed, you stop in thin air, unharmed. Otherwise, you hit the ground for normal falling damage (see Falling).