It was a busted coverage by someone. I'm sure a coach or player will explain what happened.
Newman jumped the WR screen to the outside receiver, and the inside receiver faked a block and took off down the sideline. Whether Newman was supposed to do that, and whether Henry or Davis was supposed to pick up the other guy, is what we don't know.
Even if it was against Newman, like I said the other day, it wouldn't change the fact that he has been the best shutdown cornerback in the NFL over the past 29 games -- nobody has been better at limiting catches, yards and touchdowns.