Chase Lang and Adam Tambellini each had a pair of goals for the Hitmen, who lead the best-of-seven series 2-1, while Taylor Sanheim and Pavel Karnaukhov added the others.
Tim Bozon led the Ice with a six-point outing, including two goals. Sam Reinhart and Rinat Valiev also had two goals apiece for Kootenay and Matt Alafar chipped in with a goal and an assist.
Calgary's Mack Shields gave up four goals on 21 shots in 34:42 before giving way to Brendan Burke, who stopped 8-of-11 shots in relief. Wyatt Hoflin kicked out 30-of-38 shots for the Ice.
The Hitmen went 2 for 5 on the power play while Kootenay failed to score on either of its chances with the man advantage.
Kootenay hosts Game 4 on Wednesday.
PATS 5 BRONCOS 4 (OT)
SWIFT CURRENT, Sask. — Austin Wagner scored 1:25 into overtime as Regina moved one game closer to a second-round appearance by beating the Broncos in Game 3.
Colby Williams, Adam Brooks, Braden Christoffer and Jake Leschyshyn also scored for the Pats, who lead the first-round series 3-0. Daniel Wapple made 24 saves for the win.
Colby Cave had a pair of goals for Swift Current, Max Lajoie scored once and set up two more and Coda Gordon had a goal and an assist. Landon Bow stopped 43 shots in defeat.
The Broncos will try and avoid elimination when they host Game 4 on Wednesday.
WHEAT KINGS 3 OIL KINGS 2
EDMONTON — Jordan Papirny made 34 saves and Nolan Patrick scored the eventual winner as Brandon edged the Oil Kings in Game 4 to take a 3-1 series lead.
Tyler Coulter and Rihards Bukarts also found the back of the net for the Wheat Kings.
Brandon Baddock and Andrew Koep scored for Edmonton while Tristan Jarry turned away 30-of-33 shots in a losing effort.
Game 5 goes Wednesday in Edmonton.
ROCKETS 5 AMERICANS 3
KENNEWICK, Wash. — Cole Linaker had a goal and an assist and Jackson Whistle made 19 saves as Kelowna toppled Tri-City to go up 3-0 in its first-round series.
Riley Stadel, Tomas Soustal, Chance Braid and Tyson Baillie supplied the rest of the offence for the Rockets.
Beah McCue struck twice for the Americans, who got a 20-save outing from Eric Comrie. Jordan Topping added the other.
Tri-City hosts Game 4 on Wednesday.
THUNDERBIRDS 5 WINTERHAWKS 2
KENT, Wash. — Jerret Smith had two goals and an assist and Taran Kozun made 35 saves as Seattle took Game 3 from Portland.
Roberts Lipsbergs, Alexander True and Scott Eansor also scored for the Thunderbirds, who lead the first-round series 2-1.
Nicolas Petan and Dominic Turgeon had a goal apiece for the Winterhawks. Adin Hill turned aside 24-of-28 shots in defeat.
Seattle welcomes Portland for Game 4 on Wednesday.
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