It turns out, Derek Youmans never touched the San Francisco cop who pounced on him at the airport in the video.All he did was offer a handshake before attempting to walk away, already having obtained the cop’s name, Keith Parker, over not having been allowed on a plane earlier after he was falsely accused of drinking (more on that later).When Youmans turned to walk away, the cop slapped him from behind, knocking him to the floor, drilling his knees into the back of Youman’s head while using his hands to further press his face into the floor, yelling “stop resisting!”Several other cops came running up and piled on him, grabbing his limbs as Parker twisted his arms behind his back and handcuffed him.