Ok, here's the the bottom line; there are obviously three flashes going on here, so he has either got three separate external flashes and some EPIC timing or he has one external flash and some epic skills in Photoshop. But like I said earlier, this is a great shot either way.
three different set of shots, take the best of each to line up and not overlap too much, layered in any pshop program, not hard, but hes done good....!!
I took this photo or these two separate photos and pasted them together. no big deal i ps at all. Since the camera is on a tripod its just to put the pictures on top of each other and erase where the second rider is in the air and POW "there you suddenly have some perfect timing" http://www.pinkbike.com/photo/2232897/
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