You can find this dvd on http://decknique.net to get this Tornado Cut. To answer this question to the person who started this thread, I am still practising and all I need to do is speed it up.
it is not De'vo that teaches the trick !!! Ashford Kneitel is the creator of the flourish and his dvd is out of print...
It is taught on his dvd "The tornado cut" and in Hit the road with lee asher and R.paul Wilson with an extra 4 card production...
The trilogy vagley teaches it
It's actually not out of print, the site that used to sell it is just down. However if you want to purchase it you can still email Lonnie Dilan and ask him about it. If you are interested PM me for his email, since I don't want to spread it all over the forums.