Original Message

I'll give my take on this, but I'm not going to ride the VRS/SWP merry-go-round.  You guys can decide for yourselves which term doesn't wad your panties.

VRS and SWP are synonymous terms for the aerodynamic condition of a helicopter's powered rotor system generating so much induced flow that it exceeds the lift it provides, resulting in a descent.  Reference your favorite textbook for more precise wording.  https://www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/helicopter_flying_handbook/hfh_ch11.pdf

This is distinct from the simpler physics equation of power required vs. power provided.  You are correct that the VRS demo method I described begins as such a situation.  Max endurance power and airspeed means you are using as little power as possible to maintain straight and level.  So when you bring the nose up and begin to decelerate, the same power setting will be inadequate to maintain altitude.  But if you maintain that pitch attitude and power setting, the aerodynamic condition of VRS/SWP will begin to occur (in any helicopter).  I like it because it's eye-opening to realize that, despite the alarming rate of descent that develops, it is often not a dramatic or violent seat-of-the-pants feeling.  You either need to notice the altimeter/VSI, or ground rush (yikes) to notice it.  Beware target fixation, task saturation, etc.

The demo technique is simple, repeatable, and the real thing, making it good for instructing and learning.  Give yourself plenty of altitude on entry and knock it off with plenty to spare or whenever you need more than small cyclic movements to maintain that attitude.  The point is to notice the earlier cues (or lack thereof) and recover appropriately, not to see how extreme it can get.