Insufficient application of left pedal upon approach to a deck I would say.
This was a Desert Ducks aircraft in the Persian Gulf, only injury was a broken wrist from what I heard. It is assumed to have been a loss of tail rotor drive for some reason.
In other threads...the lack of tail rotor rotation is described as being "strobing effect" by the video camera and not an actual slowing of the tail rotor.
Looking at the sequence of events....it appears intuitively obvivous the tail rotor ceased producing thrust for some reason and the turning rate of turn increases as the aircraft remains in the hover....till it was such a rate or rotation the aircraft could not remain on the deck when the collective was finally dropped to allow the aircraft to touch down.
I see two courses of action available to the pilot. Immediately bottom the collective and chop the throttles and pray you stay on the deck. Or...hold the hover but move away from the ship and execute a hovering autorotation to the water.
Neither one being a really great option. Given the time it takes to recognize the problem and then form your plan then respond...don't know how successful either would be.
Pretty impressive landing I would say.