Loss of tail rotor at speed does not result in a spin until the aircraft slows to below around 40 knots. A Bristow Tiger had just such a loss of tail rotor in the 80's and only lost control on final approach at Aberdeen when the speed came below around 40 knots.
So, thinking about the tail rotor scenario, somebody talk us through this for a Super Puma on approach to Sumburgh at a few hundred feet with 150' rocky obstacles in the vicinity.