SASless, I cannot say that this applies across the board, but as I understood it, a modern quality FADEC works by monitoring a multitude of inputs and one of these is ‘rate of change’ of the input by the crew. In normal use, the FADEC should protect the engines from overtemps/overtorques/overspeeds etc.
However, in the event that a life threatening situation occurs and you snatch the collective up and hook it on to the hat rack, the FADEC software senses the deliberate and very high ‘rate of change’ and the software should override all limitations and provide the maximum emergency power that the engine is capable of providing, even if this results in buggering the engine.