>The human body naturally has "fixin' to go" things it does before hitting the "go" button.<
You hit the nail right on the head. These minute adjustments are most clearly seen during demonstrations wherein the person giving the demonstration is "breaking down the moves" to the viewer. If you want an example, watch Larry Tatum's excellent "Tip of the Week" videos. In them you'll notice that he makes these minor adjustments as he's talking. Every good demo person does this (Mr. Parker was the best at it because he did them almost imperceptibly) so that our demonstration to the viewer presents the technique in its best light - the ideal phase.
In real time, however, the confrontation often occurs too quickly for us to make these minor adjustments, and as a result, the exchange isn't in the ideal phase. I think what we're seeing in Martin's demonstration is that because he knew what was coming, he made the minor adjustment so that he demonstrated the technique in the ideal setting. Had this happened in the street, my sense is that he would have subconsciously eliminated the adjustment.
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