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.
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The Bristow Tiger did NOT have a tail rotor failure.
The tailrotor drive shaft cover came open as the aircraft slowed below 40 kts and severely damaged the tail rotor. Tail rotor control was normal up to that point.