Not too shabby, and very well set up (though you can just about see a support of some kind towards the end when the police boat arrives - the water is lapping behind him). But I've never been nearly as impressed with such grand illusions as I am with simple table-top affairs (card tricks, cup-n-fluffy-ball-trick, etc), when you are looking at every single move the magician makes and still cant work it out. Not as flashy, but more impressive for it, I think.
Still a damn fine spectacle for anyone who just happened to be watching the river at the right time