10-3-A PUNCH and "Fanning."

[12 piece bucket]

In the section on 10-3-A PUNCH, "the Right Forearm must have a "Fanning" type of motion, not a "Linear" Push Stroke type of motion (10-3-C)."

I'm a little lost here. What the heck is a "Fanning" type of motion? In 12-1-0 DRIVE LOADING BASIC PATTERN (HITTING), the Stroke - Basic is Punch. So when you actually hit or punch something does the elbow operate in a "fanning" motion?

Little help.

Thanks!

Richard