Junior Derek Arnold scored the game’s only goal 11:09 into the third period. Lowell’s Connor Hellebuyck and BU freshman goalie Sean Maguire maintained a 0-0 game for over 50 minutes, and Hellebuyck wound up with 37 saves, Maguire 29.On the Lowell goal, senior forward Wade Megan lost the puck near the Lowell blue line. That sprung the River Hawks on a 3-on-2, and while BU stopped them on their initial chances, Arnold came around the net and flipped the puck over Maguire while he was down to make it 1-0. The Terriers opened the game with energy, outshooting UML 8-6 in the first period and establishing possession in the offensive zone much better than they did the last two times they saw Lowell. BU made a few defensive miscues in the second that almost hurt them, including one where freshman defenseman Ahti Oksanen sent the puck softly into open ice in the defensive zone and UML’s Ryan McGrath picked it up. McGrath drew Maguire to the right side of the net and tried for the wraparound, but O’Regan stopped him at the goal line. Through two periods, BU led in shots, 26-21, but neither Hellebuyck nor Maguire had yielded a goal. The Terriers opened the third on the power play but never really threatened Hellebuyck. When the player in the box, Colin Wright, got out, he picked up the puck in the neutral zone and took off on a breakaway. He fired into the crossbar, and the puck came back out onto the ice through Maguire’s legs. Lowell’s goal came about eight minutes later, and after it was 1-0, the River Hawks clamped down, limiting BU’s chances in the game’s final minutes.