"I thought we did our best to try to avoid contact. It's a tough call," Ruff said. "They make a decision on the ice, and it's made."
After a disputed icing call, Garbutt received a penalty for unsportsmanlike conduct. While he was in the box, Schwartz took a cross-ice pass from Sobotka and put the puck into the open right side of the net.
"It was frustrating to get that goal waved off, especially after the one they had in St. Louis on us," Garbutt said. "But I can't really do anything about that. That was definitely something I had to fight back from and help the team."
Schwartz has 13 goals this season. His five-game streak has him halfway to the Blues record of 10 set by Brett Hull — twice.
Lehtonen stopped St. Louis' second-best scoring chance in the period with a pad save of Vladimir Tarasenko's wrist shot.
Neither team had a goal or a penalty in a defense-minded third period, when Dallas outshot the Blues 8-4.
"We were outplayed in the second, but in the third we really managed the game properly and did a good job," Hitchcock said.
Oshie received a slashing penalty at 1:11 of overtime, but the Stars couldn't take advantage.
"You look at the attempts at the net and the amount of chances we had vs. they, and they're a better team at finishing off some opportunities," Ruff said.
NOTES: Dallas is 3 for 63 (5 percent) with a man advantage at home this season. ... With Backes sidelined and Alexander Steen on injured reserve, St. Louis was without its top two goal scorers. ... Dallas' Alex Chiasson returned after missing two games because of the flu. ... Also returning was Blues forward Brenden Morrow, the Stars' captain for six-plus seasons, for his first game in Dallas since being traded last March. The Stars played a video tribute to Morrow during a first-period timeout. "It was a nice little tribute. I just wanted to make sure I got through it, didn't tear up and acknowledged everyone," Morrow said.