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DENVER, CO - SEPTEMBER 13: Peyton Manning (18) of the Denver Broncos walks off the field during the fourth quarter. The Denver Broncos played the Baltimore Ravens at Sports Authority Field at Mile High in Denver, CO on September 13, 2015. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)

DENVER, CO - SEPTEMBER 13: Peyton Manning (18) of the Denver Broncos walks off the field during the fourth quarter. The Denver Broncos played the Baltimore Ravens at Sports Authority Field at Mile High in Denver, CO on September 13, 2015. (Photo by AAron Ontiveroz/The Denver Post via Getty Images)