I think that you will find that this stationary rotor is a visual effect caused by the flicker rate of the video camera and the RRPM of the Hind being very similar so you get the same effect as viewing a moving object under stroboscopic lights - it looks stationary. The clue is that the tail rotor is also moving slowly because it is not at the same RPM as the head.
HF
(SS I hope your version was tongue in cheek
)