That killer instinct you may have hoped the Bruins had somewhere in them did not surface last night at the Air Canada Centre. And the scoring touch, which had been so unreliable in the regular season before surfacing earlier in the series, has gone missing again as well. As a result, the B’s dropped their second straight game to the surging Toronto Maple Leafs, 2-1, to force a Game 7 at the Garden tonight. The winner will take on the winner of tonight’s Game 7 between the New York Rangers and Washington Capitals in the Eastern Conference semfinals. And if the B’s bring the same finish and determination in the offensive zone that they have the last two games, it won’t be them. “As I said to all our players, we’ve been a Jekyll and Hyde hockey club all year and that’s what you’re seeing now,” coach Claude Julien said. “It’s important for us to bring a good Bruins team to the table (tonight) in Game 7.” They’re now in the exact spot they didn’t want to be in when they seemingly put a stranglehold on the Leafs with the Game 4 overtime victory here Wednesday to take a 3-1 series lead. Now they’ve got a young, talented Leafs team without an ounce of pressure on it believing in itself. All of that pressure, seemingly anyway, is squarely on the shoulders of the B’s, who have a Stanley Cup between themselves and their 2010 collapse to the Flyers. But that ignominious defeat, after being up 3-0 in both the series and Game 7, is surely still in the memory bank, and there’s no telling how much weight it carries.