Few people seem to have realized the secret application of the opening is an X-block/ wrist grab with footwork to a sudden knife attack., either upward to the torso or downward. This is why the ROLLOVER method is WRONG as why would you move the knife further toward you?
Because I don't presume that it's for a knife defense in the first place.
First the wrists cross at the human centre ( Heart) - this is central and fairly non-commital, - then cross down in front of the Earth centre (belly button) then slide upward to cross at the Heaven centre (mouth height) - it's so fundamental it's repeated in all three forms!
I first saw this application years ago on the Cris Crudelli Mind, Body, Kick-A** Moves TV doc. show but I'm not sure which episode it was in.
Luckily, Sifu Julian de Boers, graciously demonstrates the application here:
Du oh - so that's what it's for du oh silly me, du oh but I was told there are no secrets in WC doh!
Many WChunners have conditioned their nervous system wrongly by repeating certain movements thousands of times - I love that middle height, bent wrist bon sao LOL!
I feel like this application is a bit far-fetched. If it works, more power to ya, but I'm not buying it.