Ad Clark III

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I thought the critical engine was determined by Asymetrical blade thrust(Pfactor). On one engine the aerodynamic thrustline of the engine is inboard of the propshaft and on the other it is outboard of the propshaft. Therefore you dont want the engine that has the aerodynamic thrustline inboard to quit because then you would have to fight the most yaw with the other remaining engine. Thats why its critical that it stays running! It certainly doesnt have anything to do with torque since both motors make the same.
I also thought when an airplane gets slow and yaws left with power its because of spiraling slipstream effect and P factor. Same on takeoff. Torque produces a rolling effect, not yaw. Hence the maneuver "torque roll", not "torque yaw". At least that is what I remember from my private pilot days. Anyway.....thats my .02