[Yoda]

. . . I remain confused by what is meant by a "right arm throw" being a trigger for the release of PA#2 in a swinger's action.

. . . I also cannot understand how a "right arm throw" works differently (from a biomechanical perspective) when it acts as a trigger rather than a power stroke.

Jeff,

Homer Kelley himself, as both you and I have specifically noted in our previous posts, specifically said that the Right Arm Throw is:

". . . USUALLY RESTRICTED TO HITTING." [10-20-B / All Caps emphasis mine.]

Now, inspired by a Tom Tomasello video, its major promoter and your own curiousity, you have entangled yourself in a web of your own making. In your quote above, you are confused by your own postulate of the Right Arm Drive (Accumulator #1) of a Swinging Action (your Post #30 wherein you introduce the 1-2-3 Triple Barrel Swinging Stroke):

"Then his right arm throw action induces a passive release of PA#2 via centrifugal action (rather than an axehandle technique of radial force being applied against pressure point #3)."

In fact, as I've previously described, neither the Right Arm Thow Trigger nor the #1 Accumulator Right Arm Drive is compatible with Swinging.

You can attempt either, of course, or both. But . . . .

Only at your own peril.

Which is what Homer said in the first place.