Don't know about the Dcuhess but a friend of mine was in a B55 doing initial ME training and at about 6000 ft agl they were doing simulated Asymmetric handling and the student was struggling to identify the correct engine that was inoperative.
He was like trying this and that trying to sort it out. He used to use the old trick to put his toe underneat the rudder pedal to prevent the student from stepping on the wrong pedal?
And the next moment they had a real failure on the one engine and because he wa snot expecting it and the student stepped on the wrong rudder . . . .
The one engine at approx 65% and the aircraft was inverted and in a flat spin - the throttles were both retarded - slight bank and rudder inputs - without luck - then tried all the other tricks in the book - after loosing approx 2000 ft they were not inverted anymore. The spin was not that violent anymore but would not end - so he realized instantly would not get out - had to try and restart the dead engine - told the student to try changing tanks and then turn the starter - Through divine intervention the engine started and the instructor was able to nurse the aircraft out of the spin by using differential thrust at an altitude of approx 500 to 700 ft agl.
Subsequently they discovered dirt in the fuel line on the main tank of the engine that failed.
VG300