Been in the incubator for a while. Lurking around on diff tgm sites and talking to other AI´s. Could it be explained as follows?
The Alternate Target Line is the line that the Sweetspot covers, also referred to as the Right Forearm Angle of Approach.
This "Angle of Approach" would be just that for Hitters but for Swingers it becomes an "Arc of Approach" because of the pivot rotation. If no rotation - Hitting - then it's Angle of Approach.
Thanks in advance
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