When Jarome Iginla spurned the Bruins late on March 27 and chose instead to be traded to Pittsburgh, many B’s fans circled tonight’s game on their calendars. With Iginla coming to town with the Pens, it would be their chance to show the former Calgary captain just what they thought of his decision. So much has changed since then, of course. Monday’s bombings at the Boston Marathon were the kind of horrible, perspective-changing event that makes this game seem almost an afterthought. And Pittsburgh will be arriving without Sidney Crosby (jaw), James Neal (concussion), Paul Martin (thumb) and Evgeni Malkin (shoulder). But all that doesn’t change the fact that the B’s need a win very badly, if not for their place in the Eastern Conference standings (though they are in a backwards battle with the struggling Canadiens for the top spot in the Northeast Division) then for their overall confidence. They are currently on a three-game losing streak, all against teams (Islanders, Hurricanes, Sabres) they should have some expectation of beating. They played better in the emotion-charged shootout loss to the Sabres, but it would be nice to get a win against the best team in the East, against whom they are 0-2.