Exactly! If the MGB is powerd the airframe wants to go opposite direction to the MR direction. If MGB is not powered the frame wants to go with the MR. There lies the trick with the 350 as the TR is countering a non existingnforce if the MGB is not powered and pushing the tail where it wants to go with the MR if say the MGB input shaft failed. Only way to stop is to take eng to grnd or shutdown as no use to MR?