[nuke99]

I think I do. You're asking, "If extensor action and the hitter's drive-out both involve triceps activation, and extensor action is active from startup to both arms straight, what differentiates the triceps activity of extensor action from the triceps activity of the hitter's drive out, considering that the triceps only extends the arm at the elbow?" Am I on the right track?

Yub, for your first paragraph... as stated in 6B1D...

Because of Extensor Action, the Right Triceps can never be totally "passive."

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Maybe the difference between extensor action and the hitters thrust is felt at an anatomical level. In other words, the triceps muscles are extending in both cases. But maybe other muscles (pecs, anterior delts) come into play during the hitter's drive-out, while they don't necessarily do so in extensor action??

Not really... My point is how the Tricep power is assembled will differentiate between the tricep being a acc 1 or extensor action or both. pls refer the TGM quote of 6b1D