One thing worth considering aside from what you "feel" is what you DO during the movement.
I would also use the cue of "don't push off your back/non-working leg" to convey the idea that what I actually WANT is to see the upper/working leg and hip maintain a reasonable level of control (resisting internal rotation of the femur, or what I refer to as "bambi learning to walk") throughout the movement.
So if you have a mirror or training partner to provide feedback, as long as your working leg isn't buckling inward, you're probably doing things right.
Also, assuming that AC and I still share some basic understanding of training (although I'll still continue to argue static stretching with ya' Alwyn!), and if I'm interpreting the core concepts of the book correctly, the goal isn't to completely isolate anything...
Spinal flexion and the potential for excessive lumbar rotation (due to the single leg nature of the exercise) while FATIGUED and LOADED comes with it's own degree of risk. This isn't to say it's a 'bad' exercise by any means, but taking the 'spring' out of your back and back leg would also serve to minimize risk of injury during the transition from eccentric to concentric at the bottom of the movement.
(kind of like looking both ways before you cross the street minimizes your risk of being run over by a bus, but there's STILL going to be a risk of slipping, tripping or being hit by a meteorite)
... but then again, maybe I'm just over-complicating things.
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