Dhruv's fly at Siachen and are performing exceedingly well. Back in 2k5 there were some issues with the tail rotors but those were fixed. Could have recurred. But again, it was at an airshow so pilot error can't be ruled out.
The tail rotor did not seem to have stopped working completely as there wasn't much spin apparent in the video, the controls just seemed to have gone lose. Probably have to wait till the enquiry is concluded to decide who's at fault here.
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Tu dhoop hain jham se bikhar
Tu hai nadee o bekhabar
Beh chal kahin ud chal kahin
Dil khush jahan teri toh manzil hai wahin.