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Ravell Call, Deseret News
head coach Bronco Mendenhall of the Brigham Young Cougars watches during the first half of NCAA football in Boise, Thursday, Sept. 20, 2012.

Fans on Twitter reacted to the fall of Riley Nelson, the rise of the Cougar defense, and more during BYU's 7-6 loss to Boise State on Thursday night in Boise.