It is attached to the string... just not the part of the string most of y'all are thinking about.
This is going to work very similar to the spot hogg whammy. It is taught at brace, and since it is attached to the up stroking "cable" (in this case the take-up side of the string) it will come slack at full draw.
They were supposed to be shipped with the Promo Reezen's.... we got a letter instead. Something is still being worked on.