San Francisco 49ers nose tackle Mike Purcell (64) returns an interception by Dallas Cowboys quarterback Dustin Vaughan, bottom, for a touchdown during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015.
San Francisco 49ers nose tackle Mike Purcell (64) returns an interception by Dallas Cowboys quarterback Dustin Vaughan, bottom, for a touchdown during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. Tony Avelar AP
San Francisco 49ers nose tackle Mike Purcell (64) returns an interception by Dallas Cowboys quarterback Dustin Vaughan, bottom, for a touchdown during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. Tony Avelar AP

Vaughan takes step back in loss to the 49ers

August 23, 2015 11:54 PM

UPDATED August 24, 2015 12:35 PM

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