Louisiana Tech sank 58.5 percent of its shots and got 28 points from Raheem Appleby while improving to 8-2.
Northwestern (3-5), falling for the fifth time in six outings, was led by 28 points from Jalan West despite the Demons making only 39 percent of their shots.
The final margin was the largest of the night. The Bulldogs outscored the Demons 58-32 inside, and 30-20 on fast break points.
“Our whole game plan was to attack their press, and instead, we stepped back and threw it away again and again. We had 14 first-half turnovers. We had 13 for the game last Saturday at Memphis,” said NSU coach Mike McConathy. “Some of the credit for that goes to their defense and some of the blame goes to us.”
NSU finished with 19 turnovers and was held 18 points below its season scoring average.
DeQuan Hicks added 19 points and Zeek Woodley had 10 for the Demons.
Louisiana Tech picked up 13 points by Alex Hamilton, 12 points, 12 assists and four steals by Kenneth Smith, and 10 points from Kenyon McNeail.
The Bulldogs had 15 turnovers and made 11 steals.
“We’ve got to get to where we defend somebody,” said McConathy. “Give credit to them because they are taking advantage of the new rules and taking the ball to the basket aggressively, and we did not stop them very often. We aren’t all on the same page with our defensive responsibilities, and Louisiana Tech took advantage of us almost every time we hesitated on that end.”
The Demons were within 30-26 with 5:05 left in the half but gave up seven unanswered points and trailed 45-34 at the break. NSU moved within 55-46 with 14:42 to go, and stayed within nine until another 7-0 burst by Louisiana Tech launched a 12-2 run into a 70-51 lead with 11:54 remaining.
The Demons battled back to an 11-point deficit at the 5:48 mark but a third 7-0 spurt by the Bulldogs reestablished control for the winners.
The Demons play their only home game of the month Saturday at 3 p.m. in Prather Coliseum against longtime rival Louisiana College.