The Warriors posted their lone lead on their opening possession, marching 70 yards in nine plays and Westin Elliott throwing a 16-yard touchdown to Jacari Carter.
The Dukes (3-1, 1-0 Northeast Conference) responded with Perrantes throwing a 3-yard scoring pass to Cyrus Holder to even the score. Jeremiah Josephs' bobbling interception of Elliott on Merrimack's ensuing drive set up a short field and Billy Lucas ran in it from the 5 for a 14-7 lead.
Leandro DeBrito intercepted Elliott, and Josephs followed with a near pick-6 after Duquesne's offense turned it over on downs. Elliott regrouped to help lead a nine-play, 75-yard drive where he again connected with Carter on a 16-yard score.
Perrantes closed the door on Merrimack (3-2, 0-1) in the third when he threw a pair of touchdowns to Garrett Owens and another to Wykeen Gill.
Elliott threw for 203 yards and Carter caught 11 passes for 93 yards.
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