I was thinking exactly the same thing... Autogyros have had the ability to engage drive to the top rotor for many many years.
@Andus McCoatover I don't really get your point, are you saying that they are dangerous or not... He walked away from in unscathed didn't he? Take off and landing are the most dangerous times for any aircraft, you just don't have the height or time to make any kind of recovery. The engine cut and drops gently to the ground theory works only for helicopters and gyros when they have the height or momentum. If you are hovering 20 feet above the ground with no forward momentum, altitude or time to use to generate some downward momentum and the engine dies, then you and gravity are going to be having a disagreement very shortly!
If you have the height you use the drop to get the blades spinning, very much how the original article describes the vertical jump, get the energy into the rotors, then just before you meet the ground in a very intimate way, you pitch the blades so their rotation provides a lift and slows your decent.
Just like this... http://www.youtube.com/watch?v=phaWRjAVnes
At least in the UK the helicopter pilot licence requires you to be able to perform a controlled landing without power.