You perfom this move by pressing B+K when he is backturned. Also you can do this as Just Frames out of 3 Moves. 3K:B+K, 4KK:B+K and 8A+B:B+K. If you dont understand what im writing here you should search the forum on the notation.
I already know about that one, Its the slower version of what im talking about , the one im talking about is the quicker version of BK where no hesitation he just attacks with his swords. Sorry if im not being clear.
Actually you are not clear at all :) I dont get what you mean. There is no quicker version of B+K, this move is already quick itself. Maybe you mean the one where he teleports first?
Watch this vid, maybe you'll find the move there....