NEW YORK — It was the blooper that will live in infamy.
Tuukka Rask  lost an edge and then his balance and fell over at exactly the wrong time, allowing Carl Hagelin to score and cut Boston’s 2-0 lead in half with 11:21 left in the second period. Hagelin shook off Johnny Boychuk  just enough to flip a backhander on net that Rask would’ve normally turned aside without any fanfare. But he fell backward.
“I took a step to the side,” Rask explained. “There was what I think was a skate mark or something. That’s what it felt like. I lost my balance and the rest is history.
“Happens maybe twice a year in practice. Focus, got to be more focused, I think. Just a tough mistake. Looks pretty bad on TV. Just sloppy, I think. It kind of freezes you, and you still have a second to decide whether you’re going to scramble with the paddle down or just try to wrap your way around. Just awful.”
Rask was burned again on another bizarre goal when Derek Stepan stripped the puck from captain Zdeno Chara  while Rask was still settling into his crease. Stepan wrapped around a shot into a vacated net and the game was tied 2-2, early in the third period.
“Nothing,” Rask said of what he saw on that goal. “We tried to wheel it [out of the defensive zone]. A guy surprised us and I couldn’t do anything, didn’t see anything. We gave them a couple of gifts, obviously. That’s, at the end of the day, what costs us a lot of energy, a couple of leads and the game.
“It’s a game of mistakes. Every team makes mistakes, every player makes mistakes and you just have to learn from them and move forward. I don’t think a couple of mistakes are going to make us a bad hockey team. It’s just what happens sometimes and you just have to shake it off and move on.”
The Bruins and Rangers would exchange goals, including the Bruins getting burned yet again for too many men on the ice in a playoff game. The game went to overtime before Chris Kreider finished a perfect pass from Rick Nash  by netting the game-winner at 7:03 of extra time.
“I thought that was the best goal of the night for them,” Rask said. “That was a really good goal. A really good tip. I could’ve had it but I couldn’t get there. Can’t blame myself too much.”