Seattle defenseman Jerret Smith scored twice, including an empty-net goal at 18:34 of the third period, to give the T-Birds a 2-1 series lead.
Mathew Barzal assisted on all four of Seattle’s goals to lead the offense. Millette added a goal and two assists playing alongside the second-year center and Shea Theodore had a goal and an assist for the T-Birds.
Ryan Gropp and Jerret Smith each had a goal and an assist while goaltender Taran Kozun provided 22 saves to lead the Thunderbirds to their fourth win in five games against their rival.
It was a game the Thunderbirds absolutely had to have after a 3-game losing skid left their grip on the No. 4 seed tenuous. Shea Theodore finished with three assists, Danny Mumaugh had 32 saves in his first start in eight games and Alexander Delnov tallied his 28th goal of the season to lift the T-Birds.