You might want to read carefully before you "duh" people. This is from the presstitute's purported explanation, reproduced above:
"Look carefully at the wall from that marine's head up to the top of the frame and you will see the blurred cable that was in motion because the dancer was moving it as she spoke to the marines."
I particularly invite your attention to the words, "because the dancer was moving."
That leaves me with my question unanswered: If the cord is blurred because the girl was moving, how come the girl isn't blurred?
I read your posts, then looked again, and it looks to me like the man with the blurred hands could be a cut and paste. He looks out of place with the rest. Something about the shading as it relates to the rest of the crowd.
Because the girl wasn't moving! Double Duh!
Answer this similar question: If you are a dog, how can you type your reply, because dogs don't have fingers? I particularly invite your attention to the words, "because dog's don't have fingers."
Her right hand with the cord was moving - out of the frame.