There was a lot to like about Sunday's game, but not much to like about tonight's contest.
The Penguins actually played a decent first period, getting a couple of power plays early where they hit a crossbar and a post, and some other scoring chances that they just couldn't convert.
"I thought we had the start we wanted," Sullivan said. "I thought our power play was really good. We hit two posts. If we score there, I think the complexion of the game changes drastically."
But they didn't, and instead, the game completely got away from the Penguins in the second period. The Penguins got into penalty trouble just 13 seconds in, and while the Capitals didn't score, they got four shots - which was foreshadowing of what was to come.
Washington ended up getting four total power plays in the period. And while they didn't convert, the Capitals still prevented the Penguins from establishing any sort of momentum or flow and outshot them 18-5 en route to a 2-0 lead.
"I think we self-inflicted there," Sullivan said. "Eight of the 20 minutes we were in the box."
"I felt like the whole second period we were shorthanded," Teddy Blueger said. "We'd kill one penalty off and then a couple shifts later get another one. So it was just tough to generate momentum. I think that's kind of what happened. They kept playing offense shift after shift after shift on the power play, so it was tough for us to generate offense for us or sustain pressure that period. I think that's kind of when they really took the game over and had a really good spell, and we just didn't really recover from it."
The Capitals added to their lead just 1:09 into the third, and the Penguins couldn't produce any real pushback to get into the game.
"We've just got to find a way to continue to play the game and respond the right way," Sullivan said.
The Penguins have a day off on Wednesday before hosting the New York Islanders on Thursday.