Levi Astill led the Border Bruins with four points, including one-timing the winning goal on the power-play against the Flames with 46 seconds remaining in regulation.
It was their lone goal on the man-advantage on three tries, but it was a key one.
Tyler Burke had a three-point performance for the Border Bruins, opening the scoring, then setting up the winner. Jasper Tait stopped 26 of 29 shots, allowing goals to Theo Kochan and Jakob Loewen on the power-play (2-for-5) and Zack Lagrange – who had given the Flames a 3-2 lead 6:23 into the third period.
The Border Bruins responded with three straight goals by Burke, Astill and Ryker Rougeau with the insurance goal in the final half of the third.
Flames goalie Matthew Candusso stopped 26 of 30 shots.
The Border Bruins are now one games away from taking the Mowat Cup. They will take to the ice in Grand Forks on Saturday from 7pm.
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