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I have no idea. I also use this signal on shots that are close to being 3-pointers, but are not, and I have been the butt of jokes about my adherence to approved mechanics. I think that it is a good and informative signal, just like the "not closely guarded" signal, and can alleviate confusion in situations that look like a 3-pointer is taken, but where there is actually no 3-point shot.
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