Haviland said during a post game interview a few weeks back that after initially trying a more aggressive forechecking scheme at the beginning of the season, he's made some adjustments after recognizing that they don't quite have the speed or defensive tools yet to continue such approach. So about midway through the first half, they started playing a more defensive approach in the O zone (my guess is, they're trapping more in the neutral zone and not sending both forwards and the center man in deep as often).