How to Catch a Fly - climbing back to the top of the animal kingdom - Part Two

The prevailing technique assumes that ones kinesiology of shoulder, tricep, forearm, and wrist  is fast enough to catch the fly virtually in the same spot it was when you decided to catch it.  The fly has limitless possibilities of direction.  It will not stay put; it is not going down (a dead end); and will not be moving laterally; the fly's first move is invariably UP.   The lateral sweep must be executed almost instantaneously to capture the fly before it moves.  The muscle and joint moves involved take too long and the fly escapes, always.
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This approach requires fewer moving parts, nearly unilateral movement, and a target that is within range (the length of the vertical ascent of the fly) 100 times longer.  The flycatcher might have to learn closing his hand the instant the fly "flies" into it.