It wasn't immediately clear when and how Greer got the concussion that was announced early in the second half. Arlington, Texas - With two of their top five defensive backs already on injured reserve, the secondary for the New Orleans Saints took another blow Sunday afternoon against the Dallas Cowboys when starting left cornerback Jabari Greer left the game in the first half with a concussion. Without the option of moving the injured Greer on Dallas receiver Dez Bryant, Cowboys quarterback Tony Romo routinely threw to Bryant, who torched Saints starting cornerback Patrick Robinson for nine catches for 224 yards and two touchdowns. Cowboys starting linebacker Ernie Sims, who left last week's win over Pittsburgh with a concussion, came out of Sunday's game in the first half because of what the team said was dizziness. The Saints entered the game with free safety Malcolm Jenkins and nickel back Corey White having been placed on injury reserve last week. Patrick was beaten by Dwayne Harris for a 16-yard scoring pass, then a 19-yard, score-tying touchdown catch by Miles Austin with 15 seconds remaining.