Duckett ran for 130 yards and two touchdowns on 21 carries and caught five passes for 81 yards and a score for the Thunderbirds (3-8, 2-5 Big Sky). His touchdown run at the end of the third gave Southern Utah a 31-27 lead.
Luis Aguilar kicked a 46-yard field goal early in the fourth to pull the Lumberjacks (4-7, 2-5) within a point. Northern Arizona drove from its own 19 to a first-and-goal at the Southern Utah 3 on its next possession, but the Thunderbirds held them out, including stuffing George Romero-Robinson's run for no gain on fourth down from the 1.
Southern Utah forced a punt after Northern Arizona went three-and-out on its next possession, and Duckett ran three times for a first down to allow the Thunderbirds to run out the clock.
Chris Helbig passed for 290 yards and a touchdown and Landen Measom caught six passes for 125 yards for Southern Utah.
Case Cookus threw for 325 yards and a touchdwon and Brandon Porter caught 10 passes for 151 yards and a touchdown for Northern Arizona.
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