Oh I see. Essentially, this is a method to add a "ghost" figure to the scene, which provides guides so you can match your "real figures" hands and feet to it after you have moved your "real figure", then of course you can hide the  "ghost" for rendering time.
I will tell you what this is way better than: clicking back to previous key frame a zillion times and trying to memorize with your eye where the feet or hand has to be to appear in the same position for the nex key frame!

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