On Saturday, the teams fought through a close first period, with Saints goals from Trail native Logan Proulx and Markus McCrea before a power-play effort by Jamey Kreller made it 2-1.
But Selkirk blew things open in the middle frame, with Ryan Procyshyn, Jackson Garrett, and Thomas Hardy increasing the lead to four.
Connor McLaughlin then converted on a third period penalty shot to make it 6-1 before Cody Fidgett and Jared Seutter put the score into the stratosphere.
In the weekend opener on Friday night, Selkirk burst out to a 4-0 lead after 20 minutes and never looked back.
The Saints take on SFU at 7:30 p.m. on Saturday at the Castlegar Rec Complex.