SK38... Ask questions! I surely do......I asked the same questions, the first time I really watched a world class shooter in action....the bow arm dropping went against all I understood at that time, then it was explained that when using bone structure and back tension to shoot the bow, the object was to remove any unneeded tension in not only the release side , but bow arm as well...and it takes tension in the forearm to keep the bow from moving AFTER the limbs return to brace.
I forgot to add.....Ok on the floating anchor question...each shot there was a defininte anchor point.....I was trained to establish a solid and easy to repeat anchor point....not to anchor hard against the face or lay into the string....reason being....if your using muscle tension to lay into the string hard....what happens on release?? Often the head will move..sometimes slightly, sometimes the head will move a good deal..breaking concentration on target and often the bow hand will follow the eyes...before the arrows clears the bow.
The object in posting the clip, is not an attempt to suggest anyone use my style of shooting, but to maybe explain some of the dynamics involved(I suck at explaining ) and perhaps show that basic archery form is about muscles and alignment,,whether shooting upright or leaning over and canting a bunch...its still about getting a good line!