The Sultan, not sure how much you have ever flown. I suffered an engine roll back in a single engine turboprop trainer. I have had an engine roll back (reduce RPM from flight RPM) in both an SH-2F and an SH-60B in flight. In each case use of the various emergency throttle/lock out procedures restored enough power to fly home without securing the engine. (The SH-60B NATOPS called a "a partial power loss" ... but it's the same thing).
While I've had engines fluctuate while in a hover, I've never lost one (though we certainly trained for that malfunction a lot in the sim ... )