Schenn's first goal since Nov. 30 gave St. Louis a 1-0 lead at 3:24 of the first period when he put in a rebound from the bottom of the left circle off Jake Neighbours’ shot in front.
"For me personally, I've been in this league a long time, nothing comes for free and sometimes you have to battle a little bit of adversity," Schenn said of his first goal in 17 games. "The only way to get through it is to work your way out of it, and that's doing extra and the little things to try and help. Hopefully this is a start where I can help guys like [Robert Thomas] and [Pavel Buchnevich] and stuff like that."
Kevin Stenlund tied it 1-1 at 15:56 when finished off a backhand pass from Jonah Gadjovich in the slot.
Reinhart's 14th power-play goal of the season, a one-timer from the slot at 1:11 of the second period, gave the Panthers a 2-1 lead.
The Blues had a chance to tie the game on a four-minute power play when Sam Bennett was given a double minor for high-sticking at 1:57 of the second period.
St. Louis went 0-for-4 on the power play.
"Yeah, it has to be a difference," Blues coach Drew Bannister said of special teams. "Good teams in this league are able to, whether it's separating games, whether it's to tie games up when they're down, they find ways to score goals, to give them energy on the bench. And not saying we're not getting any energy off our power play, but we have to get our power play in the right mindset that when they step on the ice, they're going to be difference-makers for us. That's what we need from those guys. They are difference-makers, they're our best players and they have to make a difference when they go on the ice."