Were it not for the facemask, the KR may have gotten another 15 yards anyway.
It's tough to say what happened in the 1st half prevented you from winning with 30 minutes to play, but 2 incidents that certainly affected the way the 2nd half was played...
ARod fumble and not challenging Gonzalez non-catch on 4th down of their first td drive.
That's at least 3 extra pts. for the Pack, 7 less for Atl.