Alston is casting a shadow on Belodeau's arm that is consistent with Thorson's shadow but not with Kerry's.
I think there's an orca rising between Sandusky and Kerry but I could be wrong.
His head should also be casting a shadow, but isn't. Take a good look, too, at his lower body. Reminds me of those Monty Python "full frontal nudity" skits, where the camera pans upward and upward without revealing anything. There's no rhyme or reason to it.