I certainly see & understand why it would be called a piston stroke if the focus is on how the cue moves vs what is going on with the arm. To me, that is what is important & how the different strokes should be called.
The comment I was responding to was made about the elbow, So... I explained it with the focus on what the elbow does. It sort of acts like a scissors.
To your knowledge, is there something different that is actually a scissor stroke?
I would appreciate learning the difference in how to explain the two different methods.