Groan, here we go again
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@ WillS ...
You are guilty of choosing whatever you like to support your "argument de jour"
Those videos which you have previously and repeatedly referred to as being exemplary. Showed the archer getting to v near full draw, dipping down to get full draw, then coming all the way up, then down a bit and finally loosing and leaping.
I distinctly remember in a previous thread analysing it frame at a time and estimating full draw being held for about 4 seconds and the leap being after the arrow had left the string.
There are so many variables that even if a leaping rolling loose does give extra distance it is impossible to say which part of it is actually making the improvement.
I don't think the leap is a part of any other flight shooting (but I'm happy to be corrected on this), whereas a snatch loose and not holding at full draw is.
Maybe the leap helps contribute to a snatched loose. Without decent high speed photography and painstaking analysis we won't know.
Finally to say it adds distance could simply be that without it their loose is poor or they are subconsciously not getting a good draw loose. In other words biasing the experiment to support their expected result. It happens in all fields of experiment, even those with fewer variables.
Del