The Los Angeles Rams take the field as fire effects go off at Los Angeles Memorial Coliseum for a preseason NFL football game against the Dallas Cowboys, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Richard Vogel)

Los Angeles Rams quarterback Case Keenum drops to pass against the Dallas Cowboys in the first half of a preseason NFL football game at Los Angeles Memorial Coliseum, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys wide receiver Lucky Whitehead returns the opening kickoff for a touchdown in the first half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams running back Chase Reynolds, center, runs for a touchdown as Dallas Cowboys linebacker James Morris (40) pursues in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Dallas Cowboys wide receiver Dez Bryant, left, pulls in a touchdown reception over Los Angeles Rams defensive back Coty Sensabaugh, right in the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Dallas Cowboys running back Darius Jackson (34) dives to attempt to escape a tackle by Los Angeles Rams inside linebacker Bryce Hager (54) in the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys quarterback Dak Prescott drops to make a touchdown pass to wide receiver Terrance Williams (not shown) in the first half of a preseason NFL football game against the Los Angeles Rams, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams quarterback Case Keenum (17) passes as Dallas Cowboys defensive end Jack Crawford closes in during the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams quarterback Jared Goff is hit by Dallas Cowboys linebacker Derek Akunne as he throws an interception on his second pass attempt during the game against the Dallas Cowboys at the Los Angeles Memorial Coliseum on August 13, 2016 in Los Angels. (Ben Liebenberg via AP)

Los Angeles Rams quarterback Jared Goff calls to teammates on the line of scrimmage during the first half of a preseason NFL football game against the Dallas Cowboys, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Dallas Cowboys quarterback Dak Prescott passes against the Los Angeles Rams in the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams running back Benny Cunningham runs for a touchdown during the game against the Dallas Cowboys at the Los Angeles Memorial Coliseum on August 13, 2016 in Los Angels. (Ben Liebenberg via AP)

Los Angeles Rams running back Benny Cunningham (23) dives for a touchdown past Dallas Cowboys middle linebacker Anthony Hitchens (59) in the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams tight end Lance Kendricks (88) is tackled by Dallas Cowboys middle linebacker Anthony Hitchens, right, as he carries the ball in the first half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams running back Chase Reynolds (34) celebrates with wide receiver Mike Thomas (13) after scoring a touchdown against the Dallas Cowboys in a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams quarterback Sean Mannion, center, passes against the Dallas Cowboys in the second half of a preseason NFL football game at Los Angeles Memorial Coliseum, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams quarterback Sean Mannion looks to throw during the game against the Dallas Cowboys at the Los Angeles Memorial Coliseum on August 13, 2016 in Los Angels. (Ben Liebenberg via AP)

Los Angeles Rams wide receiver Nelson Spruce, left, scores a touchdown as he is tackled by Dallas Cowboys defensive back Jeremiah McKinnon in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams running back Aaron Green, right, dives into the end zone ahead of Dallas Cowboys linebacker Henoc Muamba to score a touchdown in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Ryan Kang)

Los Angeles Rams running back Aaron Green leaps to make a catch against the Dallas Cowboys in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. Green ran the reception in for a touchdown (AP Photo/Ryan Kang)

Los Angeles Rams running back Aaron Green (36) celebrates with running back Benny Cunningham (23) after catching a pass from quarterback Sean Mannion to score a touchdown against the Dallas Cowboys in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)

Los Angeles Rams running back Aaron Green (36) celebrates with quarterback Sean Mannion (14) after Green caught a pass from Mannion to score a touchdown against the Dallas Cowboys in the second half of a preseason NFL football game, Saturday, Aug. 13, 2016, in Los Angeles. (AP Photo/Mark J. Terrill)