Warner covered Lamb with perfection, keeping pace with one of the most explosive receivers in the NFL, and forced an incompletion on a pass that very well could have tilted the game heavily in the Cowboys’ favor.
It's worth noting that after this play, the Cowboys gave up a delay-of-game penalty that moved them out of a comfortable position to go for it on fourth down. Not to say that correlation is causation, but it's fun to imagine the Cowboys so stupefied by Warner's coverage that they couldn't figure out what to do next in time.