Nine and a half minutes later, Sheary struck again. From behind his own net, Grzelcyk turned it over in front, putting it right on Sheary's tape. From just below the left dot, the Washington winger let it rip right away, tucking it far corner for a 2-0 Washington lead at 12:32.
That was as good as it got for the Caps on this night. Late in the first, they found themselves deep in the penalty soup, and they weren't able to extricate themselves.
It started when Evgeny Kuznetsov went off for holding at 13:27. With 45 seconds left on that penalty, Nic Dowd carved Marchand's nose with his stick, incurring a double minor to put Boston on a 5-on-3 for 45 seconds, with plenty of 5-on-4 time to follow. B's center Patrice Bergeron helped the Caps out by taking an interference minor during the 5-on-3, inserting some 4-on-4 time into the span between then and the end of Dowd's sentence.
But before the Caps could get to the end of Dowd's term in the box, John Carlson went off for cross-checking, giving Boston a shorter 5-on-3. This time, the Bruins made good on both ends. They quickly tied the game on power-play goals from Pastrnak at 18:34 and a newly repaired Marchand at 19:14.
Ullmark made two key special teams stops in the first to keep the Caps from extending their 2-0 lead; he made a flashy glove save on Alex Ovechkin's one-timer from his left dot office on a Washington power play midway through the first, and he made an even better stop on Lars Eller's shorthanded bid on a 2-on-1 late in the frame.
"The start was good," says Caps coach Peter Laviolette. "I thought we came out and did the right things; we were tight. The back-to-back 5-on-3s were tough. They score two goals and it's a 2-2 game after a pretty good first period of 5-on-5 hockey. And I don't think that we responded very well from there."
Washington's unraveling continued well into the second. They were guilty of throwing pucks away in all three zones, and it came back to bite them hard.
A Daniel Sprong turnover in neutral ice resulted in a transition goal from Grzelcyk at 2:51, giving Boston its first lead of the night at 3-2.
Seconds after Bergeron blocked Kuznetsov's bid to tie the game while Ullmark was out in Annandale, the Bruins came back up ice and made it 4-2 on a Craig Smith goal at 7:53. Smith's goal put an end to Zach Fucale's night; he yielded the Caps crease to Vitek Vanecek after being reached for four goals on 16 shots in 27:53 of work.
Boston wasted little time in baptizing Vanecek. A Tom Wilson turnover in Boston ice enabled Urho Vaakanainen to quickly send Taylor Hall off on a 2-on-1 with Pastrnak. The former fed the latter, who made it 5-2 on the first shot on Vanecek.
After about four minutes of quiet, Erik Haula made it a 6-2 game at 13:06, scoring Boston's sixth unanswered goal in a span of 14:35 of playing time.
Washington got one back late in the second when Ovechkin hit T.J. Oshie going to the net to halt the Boston string of unanswered goals at 14:06, making it 6-3.