Αt 2:26 of the video Tracey Smith AoR begins describing, on the reflex of the adrenal gland (one of the most important reflexes) the clockwise and anti-clockwise approach of Ruth Hull.
The comparison with the "screw" is accurate and helps visualize what you are trying to do.
Now at 3:08 something really interesting can be noticed, especially if you are trained in Orthopedic Reflexology (OR).
The third technique, is according to Suzanne Enzer, named the "unwind technique", and it is a sedation technique.
The direction of rotation depends on which foot you are working on. So on the right foot an anti-clockwise movement is made but on the left foot a clockwise movement is made. (light blue arrows in the picture above)
Tracey Smith comments that this acknowledges the direction that energy or chi flows around the body, meaning down the medial leg and up the lateral leg.
She also correctly uses the term "restore natural balace and calm reflexes"!
Well through OR speculation. Suzanne's technique is "right on the spot" at least having to do with this reflex (adrenal gland) and I will explain this.
At this reflex point, anatomicaly, is something very important that basic Reflexology training has not covered.
And why should it? The truth is, that learning the anatomy of the foot can be very frustrating and trivial if you do not specialize in the feet. And that is why in OR we have given a lot of attention to provide this vital knowledge in an easy to absorb way. Question is, should Reflexologists know their foot anatomy?
This area is referred too as the Zone of Confusion due to the many attachments of tendons to be found (right picture). But the one at hand we are interested in would be that of the peroneus longus tendon PLT (Greek) or fibularis longus tendon (latin)!
The peroneal longus muscle is attached proximally to the head of the peroneal bone and its 'belly' runs down most of this bone. It becomes a tendon that goes posteriorly around the lateral malleolus of the ankle, then continues under the foot to attach to the lateral sides of the medial cuneiform and the base of the first metatarsal.
Right around where your average Reflexologist would place the adrenal reflex. I will point out that "waistline" (most of the time) is found from the tuberosity of the fifth metatarsal and crosses across to the base of the medial cuneiform (pink arrow in the top picture).