Tuukka Rask was frustrated but not deflated. He was eager, but calm, and in the end, he was just happy to get one more opportunity to make a save — unlike the last time he was in the postseason. When the Toronto Maple Leafs scored two third-period goals in 5:29, the air was briefly sucked out of the Garden. Toronto was up 4-1 in Game 7 last night and there was nothing the Bruins could do about it, except compete. “For me, (my mindset) is just to stay focused and try to stop every puck,” Rask said. “No matter what happens out there, you still have to do the job properly. If it’s 5-1, 4-1, 10-1, you still want to compete. That’s what it’s all about.” The last Game 7 he played in, the Bruins were up 3-0 before falling 4-3 to the Philadelphia Flyers in the 2010 Eastern Conference semifinals. Rask was a rookie back then. And last night, he knew better than to fret. So he stood in his crease, competed and watched as the Bruins came away with a dramatic 5-4 overtime win over the Maple Leafs. Rask made 24 saves, but his night was better than the stat sheet showed. The Leafs made it 2-1 when Rask was screened in the second period and never saw Cody Franson’s slap shot. In the third, Phil Kessel scored after a series of fortuitous Toronto bounces. Then, Nazem Kadri scored off a rebound. “Tough breaks,” Rask said. “But then again we still had a long time to go and I just tried to stick with it and make a save and keep the game as tight as possible.”