ANAHEIM, Calif. — Mitch Marner had three goals and an assist in his first career playoff hat trick, and the Vegas Golden Knights routed the Anaheim Ducks 6-2 on Friday night to take a 2-1 lead in their second-round series.Shea Theodore had a goal and an assist and Brayden McNabb scored a short-handed goal as the Golden Knights stormed to a 5-0 lead after two periods, silencing a sellout crowd in Orange County and erasing memories of their rough offensive outing in Game 2.“Our desperation level definitely got higher,” Marner said. “I just like the way that we came out and started. The first 10 minutes really, we just played our game and got to it, and that’s something we were missing the first two games.”Carter Hart made 30 saves as Vegas moved halfway to the Western Conference finals while sending the upstart Ducks to the worst loss of their first postseason in eight years.Game 4 is Sunday night in Anaheim.Marner got his natural hat trick in the first two periods, giving him six goals in the past four games of his first playoff run with his new team. The longtime Maple Leafs forward delivered Vegas’ first four-point playoff performance since 2019 and prompted a few hats to be thrown onto the ice when he slipped his third goal under Ville Husso with 2:04 left in the second.“I think (Marner) is very confident in what he brings,” Vegas coach John Tortorella said. “People give him (grief) all the time about playoffs, and this and that, and I don’t think it bothers him a lick. He just plays. He’s a hockey player, and I’m glad he’s doing some things for us.”Marner’s three goals were more than he scored in last spring’s entire 13-game playoff run with Toronto, where the Ontario native frequently got criticism for not delivering in the postseason.“It’s always nice to try to contribute, but at the …