Arizona was aided by a BULLSHIT taunting call. On 3rd-and-goal, game tied with 4:34 left, Oregon sacked Arizona back at the 17. The defender got up, put his hands together and did a TINY little bow to the crowd. Wasn't a big thing at all; he bowed less than halfway down. Took less than two seconds. Boom, taunting. Boom, 4th-and-goal from the 17 becomes 1st-and-goal from the 9.
I think when there's a dead ball penalty, it shouldn't affect the down. If the penalty occurred when the play was OVER, then how can you change the entire outcome of the play that had ENDED? Even if they wanted to make that bullshit call, it should have stayed 4th-and-goal but given Arizona half the distance.