Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

This is supposed to be a man who is handcuffed behind his back with his elbows bent at right angles, as his right arm appears to be. But, we can't see his left arm at all, even though his left forearm was uncovered. Why can't we see it? Why isn't it there? Why does this look so weird?