So I would say that fanning and swivel are pretty much the same thing.
Fanning is when you move you Right Forearm by rotating it around and from the elbow joint -- not unlike the motion of a feeler guage that you "fan out" of the pack.
rwh~
I recall from Yoda's RF flying wedge teaching, moving the forearm to the left and right and not understanding the purpose. I am still unsure if this is a caused motion or results from the pickup combined with extensor action. My assumption is "rotating" does not reposition the right wrist from vertical to turned (4-C).