Assuming we are talking about LTE on approach, one is highly unlikely to experience loss of control due to lack of sufficient anti-torque available by following the mountain procedures taught by the Canadian Helicopters mountain school in Penticton. Before your touch down attempt, you have made a proper recce, including making a loaded disk approach with an over shoot above ETL, where you assessed torque/temp/NG and pedal reserve, and as much as possible crabbed the ship into the wind. If you didn't have sufficient power or pedal margin before falling below ETL, you would abandon that approach, under those conditions, and never have slowed below ETL. Conversely, if your approach is with an unloaded disk, to a spot with an unknown wind direction and velocity, and unknown up or down flowing air, you are about to determine at that moment whether you have sufficient power and pedal to make a safe landing. If you think that a previous review of the performance charts will tell you whether you have the necessary performance, you are not taking into consideration the effect of up and down flowing air on your ship.