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That's right.
The shutters have a horizontal slit which varies in width depending on the speed of the shutter.
It goes from top of the sensor down to the bottom. Keep in mind the image is upside down from the lens. So the top of the image here is the bottom of the final picture. That got exposed first and as the shutter moves down the sensor it exposes as it goes. So that means the guy hitting the ball got exposed later than the shadow and he was moving fast so it was a tad later in time. Its called rolling shutter effect.
A development expected of DSLRs in the future is a global shutter where the whole sensor is read out at the same time.
Greg.
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