This is a zone coverage. Zone blitz actually. They had Campbell follow Lambs motion (Z MO) and then peel off on a blitz. This caused Prescott to try and hit Lamb on the hot route. The Packers had Savage up in the zone cover and he picked him clean. A great bait job on the Cowboys by the Pack D.
And that was very good coaching. No doubt we had scouted something similar and knew where Dak was going with the hot read. As such we schemed Savage into a POSITION TO SUCCEED.