Hintz scored on a short-handed breakaway to give Dallas a 1-0 lead at 4:46 in the first period. He came off the bench on a shift change and forced a turnover. Heiskanen picked up the loose puck and spotted Hintz in the neutral zone behind play.
"We're waiting, almost, for something to happen instead of dictating what our plan is and what our identity is," Niederreiter said. "We did a great job back in Europe, and the last two games against Dallas we haven't quite done what we're supposed to do."
Hintz scored again to make it 2-0 when he slipped the puck through the five-hole of Saros 39 seconds into the second period.
"A lot needs to be better," Hynes said. "I thought they played really well, and if you look at our game, we were casual with the puck. We gave them easy offense. When you turn the puck over in dangerous areas, it feeds the other team's transition."
Heiskanen extended the lead to 3-0 at 7:48 at 4-on-4 when he redirected a Robertson pass as he crashed the net.
"I think [the new system] is more active," Heiskanen said. "I think we are playing more with the puck. I really like that. Great start for us, now we need to keep going and keep playing like this."