Bill,
I have to admit you have lost me there. A slip stroke involves the grip hand slipping backwards on the cue as the hand and cue are both going back. The slip can be anything from less than an inch to close to six inches in some cases. Then the shooter regrips the cue at this further back location which has the effect of making the cue seem longer between bridge and cue ball when you go forwards. Most commonly used with other strokes, I don't know if I have ever seen it used in pool with what I would call a "pure" pendulum.
Apologies for going over the basics but I have a feeling that we are using the same term for different things. Purely an AZB thing, we long ago decided to refer to letting a cue slip through the hand while slowing or pausing the hand on the forward stroke as a stroke-slip. That never should have been referred to as a slip stroke as the older different stroke referred to as a slip stroke should always have had precedence.
Just trying to get on the same page if we aren't. I am not familiar with a hesitation pendulum stroke.
Hu