Take a look at the difference of rotation of the subject in the blurred area as compared to the un-blurred subject. He simply turned to his right during the shot.
In order to re-create this effect in Photoshop with any accuracy (true to the original), you would need two images of the subject, one looking straight forward and the other turned and facing to the right. Then you could blur and mask.
None taken Chris, you are way above my skills level i know that.
I just say it short and sharp can't be arsed with four page screen grabs tuts and fair play to those that do. But i do my challenges in the comp threads