I'll just leave this here...
[b]THIS IS NOT MY VIDEO[/b]
Edit: Please watch the video before getting butthurt over it. Thank you.
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From what I can see. It appears that the targeting system is set to track if the shot is fired before the target moves. Therefore- if the reticle is set on the target the shot is fired it will track said target. This is speculation. It is not accurate at all, by any means and is subject to change. This is nothing more than a simple guess.