See, you missed it. There are two witness and neither saw it all. The lady you refer to, said she saw only silhouettes, she saw one guy get up, and put his hand on his head. Now, that fits. I smack my face on purpose, the last chance I have after I have flipped the body off and jumped on his back, I spread his arm out wide. Try to do that from sitting on someone will you? Just do that. You have the perfect opportunity to smack you face in the movement, your head, will move down. And you have all the inspiration in the world to do it. It is something you talk about with your MMA thug friends. Scott Peterson planned a murder with his college room mate and that is exactly how they found his wife. So, it is entirely likely to me this guy is a vigilante. And most of his story seems too pat. His micro-expressions are wrong in all the right places.