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The shadow is from the flash, which only fires for that 1/1000 of a second. But the skateboarder is still moving through the other 1/30 second as the shutter is open, so a bit of blur.
If I had been 90º to where I was, skateboarder going left to right more across the frame, it'd be more pronounced blur than that.
I can't get my head around, why it looks like there's motion blur on skater, but not the shadow..
Image is superb imo.