Answering with their own goal on the man advantage later in the first, the Maple Leafs managed to pull even when William Nylander teed up a pass from Morgan Rielly and blasted a fiery one-timer past Sergei Bobrovsky from the left circle into the back of the cage to make it 1-1 at 15:21.
Striking on both sides of special teams, Mitch Marner followed up a shorthanded goal just 30 seconds into the second period with a power-play goal at 1:07 to put the Maple Leafs up 3-1. Not long after that, Colin Blackwell found the back of the net to extend the lead to 4-1 at 2:04.
Following that goal, Spencer Knight came into the game in relief of Bobrovsky.
Back in the lineup for the first time since Feb. 21, Jake Muzzin padded the lead for the Maple Leafs even further when he buried a far-side snipe from the left circle to make it 5-1 at 8:40.
"They're fast and we weren't prepared for the pace," Brunette said. "We haven't seen a team like that for a while. We saw them two weeks ago, but we were both on a back-to-back. They were on one [again] tonight, but they came with a lot of pace. They were ready to play."
But as it has been so many times this season, the "Comeback Cats" were then activated.
Swinging momentum back in favor of the Panthers, Reinhart followed up on his own rebound and lifted a shot over Kallgren on the power play to make it 5-2 at 11:52. Less than a minute later, Radko Gudas made it 5-3 when he blasted home a big goal on the penalty kill at 12:51.
"It's 5-1 and then you get that power-play goal," Panthers captain Aleksander Barkov said. "Gudy's hard shot on the PK, that helped too. Then it's 5-3 and we're right back in the game."
From there, the goals continued to flow.
With Kallgren exiting the game after taking a shot off his mask, Claude Giroux netted his first goal as a member of the Panthers and made it a one-goal game when he chipped a pinpoint pass from Huberdeau past Jack Campbell from right on the doorstep to make it 5-4 at 17:56.
"[The fans] were in the game," Giroux said of the home crowd. "When we were down 5-1 and made it 5-2, it's like the crowd knew we were coming back. It was pretty loud out there."
On the power play early in the third period, the Panthers had their fans nearly shaking the foundation of the arena after they finally pulled even when Huberdeau potted a goal from just outside the blue paint to suddenly make it 5-5 at 2:45 with the 100th point of his NHL career.