KalamaQ, can we help?
You're making up pairs of red/blue strip sets, and from these strip sets you're cutting a specified number of triangle pairs (blue strip on top if using Easy Angle, red strip on top if using Bonnie's ruler).
With each of these sets of triangle pairs, you're sewing half of them into HSTs. The other half you're leaving unsewn.
From these sewn HSTs, you're choosing your best contrasting pairs to make a specified number of pinwheels, keeping the unsewn triangles of that pairing with that pinwheel.
The remaining HSTs that weren't sewn into pinwheels you are keeping together with their matching unsewn triangle pairs.