Did you watch the video? He couldn't have been talking about this one, his foot doesn't slide out. His plant foot is solid. His lead foot, he just never steps into the throw. He leaves it off to the left. He's just off balance from the moment where he cocks, all the way through the follow through. I could maybe buy his front foot getting caught in the grass or something, not allowing him to step into the throw properly. It makes me was to go back and look at the rest of his throws to see the differences between the accurate throws and the worm burners.