Somewhere in the camera change he either switches his hand over so it will roll upright, or he's extremely double jointed. Tricky magician! That is a really good card trick, I wish I knew a couple of good ones.
I had a guy in a bar throw a nickel through my hand and it turned into a dime in my beer. Earned him a drink w/ everyone he tried it with. Now that's a good trick, too!
-Tim