Besides the beating the Penguins took from Boeser, they also took one from the Canucks as a whole.
A Vancouver player -- either Sven Baertschi or Erik Gudbranson -- tripped Kessel in the slot late in the second period. Kessel went down hard and grabbed his head. He stayed on the bench for a bit, in obvious discomfort, before retiring to the dressing room. Kessel did return for the start of the third period.
Frank Corrado left the game for a spell when he was tossed into the boards. Kris Letang went face-first into the wall while pursuing Jake Virtanen -- but stayed in. Ditto for Olli Maatta when he absorbed a hard hit and Brian Dumoulin after blocking a shot.
Boeser pushed the Canucks in front, 2-1, with a goal that tugged the Penguins out of position at 7:14 of the second period.
Horvat started the sequence with a pass from the right corner. Baertschi kept the puck alive with his skate and sent a pass over to Boeser, who found open space to Murray's right.
The loss snapped a four-game winning streak for the Penguins against the Canucks. Pittsburgh had previously won eight of 10 and five in a row at Rogers Arena.
One of the constants under Sullivan has been the ability for the Penguins to climb back into games after two periods. They did it 13 times the previous two seasons and appeared on their way to another -- until Boeser completed his hat trick. This season, with an inconsistent offense, the Penguins are 0-5-1 when trailing after two.
The four-goal output was a rarity for a Vancouver team that began the game as one of the worst offensive teams in the league.
The Penguins grabbed a 1-0 lead on their first power-play chance of the game.
This one belonged to Guentzel, although a pretty passing sequence made it happen. Crosby swept a puck backward, through his legs to Kessel in the left circle. Kessel blew a tire but was able to get the puck to Guentzel for the near-side finish at 2:53.