Card Trick??

Question

Does anyone know how to do David Blaine's knife magic trick? he pulls out a brand new deck of cards and asks for a knife to cut the seal. then he gives the cards to a spectator and tells him to shuffle the deck and make sure its a legit deck. Then tells spectator to choose any single card out of the deck while Blaine turns his head. Spectator chooses one card and shows everyone. then shuffles it back into the deck face down so theres no way Blaine could know which card is his. Blaine then tells him to spread the cards out all over the table . he says to make this even harder im gonna cover the cards and covers the cards with a menu(they were @ a restaurant). He takes the knife he used to cut the seal and staps the menu twice. When he rips the menu away from the knife there is one card that is stabbed. then he reveals it is the spectators card. If anyone wants to see it search david blaine knife magic on youtube. Does anyone have any idea as to how this is done???

Answer 1

have no 1 dear

Answer 2

All i know is that he secretly has the chosen card in palm position when he lays down the menu, it then gets covered up and he knows where to stab to get he card.