ISLES IN OT!

Take 2-1 series edge over Panthers on Hickey’s clutch score:

ALL of the supercharged emotions the Islanders and their fans emptied out last year in the farewell to Nassau Coliseum finally reemerged in full force Sunday night in the first NHL playoff game ever played at Barclays Center.

The passion ebbed and flowed in both directions almost from the first drop of the puck, and the Islanders seized their second victory in three games this postseason on defenseman Thomas Hickey’s goal in overtime for a crazy 4-3 comeback victory over Florida at their raucous sold-out new home in Brooklyn.

“There’s not a guy on our team that plays as big as Thomas Hickey,” Isles coach Jack Capuano said. “When you talk about toughness, I’ve always defined it as taking a hit to make a play. And that’s what he does. … It’s always good to see a guy like that get rewarded.”

Hickey, who converted a feed from Brock Nelson with 7:29 left in OT, scored only six goals during the regular season, but one of those also was an overtime winner in the Isles’ playoff clincher on April 5. “I don’t ask questions right now, just shoot the puck, and it goes in,” Hickey said. “It was just a great atmosphere all night. I honestly didn’t know it was going to be this good tonight.”

While John Tavares’ line (with wingers Frans Nielsen and Kyle Okposo) carried the majority of the Isles’ attack in Florida, the Panthers have been receiving the secondary scoring Capuano covets — despite no points from ageless star Jaromir Jagr so far in the series. Reilly Smith netted his fourth goal in three games off a juggled Thomas Greiss rebound 2:24 into the game to drain some of the juice out of the towel-waving home crowd. The Panthers went up 2-0 when Smith’s wide shot caromed hard off the boards behind Greiss and right to Alexsander Barkov for the tap-in.

But the tide shifted after Aaron Ekblad’s score was overturned on Capuano’s “coach’s challenge;” it was determined that Jonathan Huberdeau was offsides earlier on the play. “Our video coach (Matt Bertani) did a great job of calling it in to us and I thought that was the turning point,” Capuano said.

“After the overturned goal, you could feel the crowd get back into it,” Johnny Boychuk added. “And we kept coming.”

Rookie defenseman Ryan Pulock rifled in a 5-on-3 power-play blast past Roberto Luongo to further rejuvenate the Isles and the nervous crowd. Nick Bjugstad’s tap-in after Hickey over-skated a loose puck on the doorstep replenished the two-goal lead for Florida, but Shane Prince converted at 11:48 to bring the Isles within one.

Nielsen then netted the Isles’ second man-advantage goal of the night for the equalizer — and renewed bedlam — with 3:05 remaining in the period, and the 3-3 tie held up through the third.

“You felt it coming, when we got that first one,” Capuano said. “This is just the team that we are. We’re not going away.”