Crab - did you ever do this one which was quite fun. Come to the hover as you say with the ASE engaged - get the aircraft moving backwards quite fast and then hand over control. The student then puts his feet on the pedals, that disengages the yaw channel and the aircraft does a snap 180 degree turn and the nose drops dramatically!! You need to keep your hands near the controls as said student can start thrashing about a bit. Happy days.........................