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Thunder the horse stands on the field before the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

A parachuter lands in the stadium during pregame festivities ahead of the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Trevor Siemian (13) of the Denver Broncos stands on the field before the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Miles and Aqib Talib (21) of the Denver Broncos do a handshake before the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Annabel Bowlen (left) stands with her daughters, Annabel (left) and Christiana (right) on the field during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Dak Prescott (4) of the Dallas Cowboys fires a pass as Domata Peko (94) of the Denver Broncos and Adam Gotsis (99) defend during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Derek Wolfe (95) of the Denver Broncos, Shaquil Barrett (48) and Adam Gotsis tackle Ezekiel Elliott (21) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Chris Harris (25) of the Denver Broncos tackles Jason Witten (82) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Emmanuel Sanders (10) of the Denver Broncos makes a first-down catch as Byron Jones (31) of the Dallas Cowboys and Nolan Carroll (24) pursue during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Emmanuel Sanders (10) of the Denver Broncos makes a first-down catch as Jaylon Smith (54) of the Dallas Cowboys pursues during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

The Denver Broncos offensive line fires off the ball as Trevor Siemian takes the snap in the first quarter against the Dallas Cowboys at Sports Authority Field at Mile High on Sunday, Sept. 17, 2017.

Emmanuel Sanders (10) of the Denver Broncos makes a first down catch as Jeff Heath (38) of the Dallas Cowboys and Jaylon Smith (54) pursue during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Emmanuel Sanders (10) of the Denver Broncos celebrates his 7-0 touchdown reception from Trevor Siemian (13) against the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Emmanuel Sanders (10) of the Denver Broncos celebrates his 7-0 touchdown reception from Trevor Siemian (13) against the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Bennie Fowler (16) of the Denver Broncos celebrates a touchdown caught by Emmanuel Sanders (10) in the first quarter of the game against the Dallas Cowboys. The Denver Broncos hosted the Dallas Cowboys at Sports Authority Field at Mile High in Denver, Colorado on Sunday, Sept. 17, 2017.

Denver Broncos quarterback Trevor Siemian throws a pass over the pass protection by Garett Bolles in the first quarter against the Dallas Cowboys at Sports Authority Field at Mile High on Sunday, Sept. 17, 2017.

Denver Broncos quarterback Trevor Siemian hands off to C.J. Anderson in the first quarter against the Dallas Cowboys at Sports Authority Field at Mile High on Sunday, Sept. 17, 2017.

Dak Prescott (4) of the Dallas Cowboys throws during the first quarter of the game against the Denver Broncos. The Denver Broncos hosted the Dallas Cowboys at Sports Authority Field at Mile High in Denver, Colorado on Sunday, Sept. 17, 2017.

Shaquil Barrett (48) of the Denver Broncos and Adam Gotsis (99) tackle Ezekiel Elliott (21) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Shaquil Barrett (48) of the Denver Broncos, Brandon Marshall (54) and Adam Gotsis (99) tackle Ezekiel Elliott (21) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Shaquil Barrett (48) of the Denver Broncos, Brandon Marshall (54) and Adam Gotsis (99) tackle Ezekiel Elliott (21) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

C.J. Anderson (22) of the Denver Broncos runs as he breaks free from Jaylon Smith (54) of the Dallas Cowboys, Nolan Carroll (24) and Sean Lee (50) during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

C.J. Anderson (22) of the Denver Broncos runs as he breaks free from Jaylon Smith (54) of the Dallas Cowboys, Nolan Carroll (24) and Sean Lee (50) during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Trevor Siemian (13) of the Denver Broncos rolls out against the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Jamaal Charles (28) of the Denver Broncos stiff arms Sean Lee (50) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.

Domata Peko (94) of the Denver Broncos Todd Davis (51) and Adam Gotsis (99) tackle Ezekiel Elliott (21) of the Dallas Cowboys during the first quarter on Sunday, Sept. 17, 2017. The Denver Broncos hosted the Dallas Cowboys.