Hi JH
Just checked Helen McGuiness book used for my training but it's not in there! It was part of the routine taught to me though.
Found it my Narendra Mehta book though, "Indian Head Massage" p. 60
Soft landing, quick take off!
With your fingers outstretched, land softly on the head. On making contact, spring off, bringing your fingers and thumbs together. Land in a different position, with your fingers oustretched. Repeat this energetic movement until you have covered the top of the head.
So not pinching, but a kind of picking motion. Good with hair, but also works without hair as it's stimulating, brinign circulation to the scalp. Can be done with both hands at same time, or alternating hands. Hope this helps!