Can we all agree that the situation described by Nick is as a result of overpitching and not LTA. Loss of Tail rotor Authority is generally taken to mean a reduction in the travel available in the TR control system due to damage to cables, rods, bellcranks etc or problems with ASE/ AFCS actuators giving a similar reduction in control authority. This is not the same as loss of TR control which would be total - LTA would be partial.
Loss of TR - it drops off or the driveshaft snaps
Loss of TR control - the cable/rod/pedal breaks
Loss of TR authority - blockage or damage or stab malfunction
Loss of TR effectiveness - you are flying a B206
Overpitching - asking too much of the engine and drooping the Nr, thus slowing the TR and reducing its thrust.
Does this seem fair?