Pittsburgh came within a second of killing off that four-minute sequence, but a Oshie got a stick on Carlson's shot from the right point, deflecting it over the left shoulder of Pens goalie Matt Murray at 18:09 of the third, with one second remaining on the man advantage.
Oshie's goal was the difference between taking a lead into the third and not doing so, and it vacuumed away any momentum the Pens might have been able to gain had they completed the kill successfully.
"It's tough," admits Pens coach Mike Sullivan. "There is one second left on the kill, and for the most part, they really didn't get much. The killers were doing a really good job. That was one of those goals that stung a little bit."
Early in the third, the Caps were faced with a pair of critical shorthanded situations, and they were able to navigate their way through each of them successfully.
"We had our opportunities," rues Pens captain Sidney Crosby. "Those power plays early in the third were probably our biggest opportunities to get back into the game, and we weren't able to do that."
With 6:18 left in the third, the Caps manufactured a critical insurance goal on a strong offensive zone shift. Alex Chiasson moved the puck from low to high, going to Taylor Chorney at the right point. Chorney put the puck back around behind the Pens cage, where Nicklas Backstrom got to it. The Caps pivot put a perfect backhand feed to the high slot for Chandler Stephenson, who buried it to push the Caps' advantage to 3-1.
Jakub Vrana notched an empty-net goal with 2:42 remaining to account for the 4-1 final, sealing the win for Washington and for Holtby.