[MrForbes]

if you look close you can see a smear of the head of the club pretty much in line with where it should be for the position the golfer's hands are in. I agree that it's most likely the scan time is about equal to the time it took to move the club from top to bottom, and the picture was taken at just the right time to get both "slow" club positions to show up, but miss most of the "fast" movement of the club at the center of the swing.