That image is so clear, we can derive things from it. Notice how stiff the fingers of the shooter are on his left hand. Many have assumed that "Ruby" was holding a card of something, but look at it close.
No, he isn't holding anything, but how could he do that with this hand? Create an angle like that? I don't think he could. I can't. You try it. And if you do it, take a picture because if you just lip-flap it, you'll irritate me, and you don't want to irritate me. Why would he do that with his hand while shooting? Why would he do anything like that?