And, look at it this way.  If you were to drop into a double, where is the next flip rotation on a misty 5, 9, or 12?  Backwards.  How about a rodeo 5, 9, or 12, backwards.  How about a misty 7, or 10? Forwards.  And a rodeo 7 or 10?  Forwards, unless you take off so backseat that you dont have a chance at landing it anyways.  It alternates with each 180, and each tricks mometum is not suprisingly, but pretty obvious the same at each of these points.