A total of nine penalties were whistled in the second. Fighting majors for Tom Wilson and Bortuzzo started the parade, but there was some four-on-four time and a brief four-on-three power play for St. Louis, and the Blues pulled even on a power play a couple of minutes after the midpoint of the period.
From just off the right post, St. Louis center Ryan O'Reilly found and fed Blues defenseman Colton Parayko, who beat Holtby at the back door, tying the game at 2-2 at 12:23 of the second.
Just over four minutes later, the Blues regained the lead. Holtby stopped an Alex Pietrangelo point shot, but Sundqvist got to the rebound first, putting a lunging backhander behind Holtby at 16:33.
St. Louis was all over Washington early in the third, too. The Blues managed six shots on net and 10 shot attempts before the Caps were able to muster as much a shot attempt.
Pietrangelo scored from center point to make it a 4-2 game at 5:44, and Tyler Bozak completed the scoring with a breakaway goal at 11:08.
The Caps are two games shy of the midpoint of the season, and they have yet to lose as many as three straight in any fashion. They'll need a victory on the second night of back-to-backs against Dallas on Friday to keep that run going. They'll also need to play much better hockey than they've played of late.
"We didn't play that well, and they wanted it more than us," says Connolly of Thursday's loss. "We didn't play our best, and they were the better team tonight for sure."