The Bruins have found new and grisly ways to lose hockey games this year. But on Thursday at the Garden, they lost the old fashioned way.

They got goalied.

Despite a wide edge in play, the B’s spotted the Islanders a 2-0 lead and only David Pastrnak could beat Ilya Sorokin (37 saves) midway through the third period as the B’s took their fifth straight loss (0-3-2). The Isles hung on for the 2-1 win.

As their season slip slides away, the anticipation is not what the B’s playoff opponent will e as it usually is, it’s how high will their draft pick be. For the second game in a row, the B’s also lost a forward to injury as Matt Poitras (lower body) left the game late in the second period.

The first period was an example of the Bruins finding new ways to take a gut punch. They thoroughly outplayed the Islanders for much of the period, at one point outshooting the visitors 15-1, thanks in part to them having the only two power plays in the period. Islander goalie Ilya Sorokin made several solid, if not spectacular stops to keep the game scoreless.

At the tail end of the second power play, Matt Poitras’ shot from the left wing was blocked and Jean-Gabriel Pageau went on the attack with Alexander Romanov coming out oof the box. Once in the Boston zone, Pageau fed Romanov and he beat Jeremy Swayman high to the shortside for an unlikely Islander 1-0 lead at 16:11.

All of a sudden, the Islanders had life and the Bruins weren’t feeling so good about themselves. For the first time in the game, the Islanders started playing the Boston end but they could not tack on another one.

The B’s held a 15-6 shot advantage – and a one-goal deficit – going into the first break.

The second period was more of the same.

Not long after Sorokin stopped Pavel Zacha on a breakaway, the Islanders took a 2-0 lead at 4:21.

Brock Nelson took a feed from Adam Pelech at the Boston blue line and moved up the left wing before taking what looked like a harmless, contested shot. But Swayman left a fat rebound and an open net for Kyle Palmieri to pop it home.

Predictably – and understandably – the boos began to rain down.

The B’s had a couple of more pushes in the offensive zone, to no avail. Then late in the period, the B’s lost Poitras in a scary looking play. Working his way back up the ice after a failed attack, Poitras was getting ridden into the boards well away from the play. It was the kind of interference that happens often and is rarely called. But unbeknownst to both Nelson and Poitras, the door at the Islander bench was opening for a change and Nelson ended up gliding Poitras right into the opening, where the young Bruin hit the boards dead-on. It looked like his chest took the brunt of the impact but the Bruins later announced he had a lower body injury.

In obvious pain, Poitras was eventually helped off through the Islanders’ tunnel while Nelson was assessed a five-minute major. Upon review, it was reduced to a minor penalty,, which was the right call.

The Bruins could not take advantage of of the 31st ranked penalty kill, however.

But at 10:04, the B’s finally got some luck. After a dogged rush along the right boards in which he fought through one check, David Pastrnak took a bad angle shot that went off defenseman Tony DeAngelo and in.

Pastrnak’s 31st goal of the season was his 800th career point and extended his point streak to 16 games.

Swayman then kept it a one-goal game with 7:32 left in regulation when he robbed Hudson Fasching on what looked like a tap-in.