B.V scored three third period goals to force extra time and forward Spencer McLean would eventually net the game winner.
It is the third straight postseason the Nite Hawks have eliminated the Leafs.
The Castlegar Rebels skated to a 5-2 win over the Spokane Braves Thursday night.
The Rebels now lead the Braves 3-2 in the opening round contest.
Game 6 goes Friday in Spokane.