ask them to now go back and record footage with full power removal. I reckon things may be slightly different. You only need to see the blades at the landing to know they are still under power. Not realistic im afraid. If an engine stops, it stops, which was what was being discussed. (if the engine quits) NOT loses power, allowing a partial power auto.
I still think unless youve trained a lot in that position, it'll catch you out quickly.