Does anyone know what might potentially be the reference of this move by Simon Black? It is 100% impromptu, convincer for sandwiched card in between. you can literally rub two cards (one card hidden between, so three card actually), as two cards. This solves ultimate reason why I do not do any sandwich effect, so I am desperate to learn this. I have experimented with some of the possibilities I thought of, some worked but was not consistent. As Simon claims, it is a technique so it should be consistent as long as you know how to do it. It would be much appreciated if someone could give me some reference that would give me idea on that thank you!