Originally Posted by sureshs
A pure open stance has both feet lined parallel to the baseline, so the shoulders cannot be sideways.
I'm not really sure what you mean by a "pure open stance" here, but it's entirely possible to have your feet pointing one way and your torso another. This is because humans have the ability to rotate their upper bodies.
It is thus quite possible to turn the shoulders sideways in an open stance, as Cheetah's photos show.
Honestly, you wasted both your time and Peliwo's if you expected some sort of revelation about stroke mechanics from him.