It does use a mirror. Two, in fact, as it utilizes the periscope principle (I hope I'm not breaking any rules here by saying so). This is one of my favorite pieces to perform in my show. It kills, and the audience loves it.
Wait, I mean it sucks and everyone hates it. Don't buy one.
p.s. Peter Loughran does not offer a PDF of this. As Richard said, Wellington has the exclusive rights from Larry White.