Just as he was as a player, Marco Sturm the coach is quick to smile and give off a positive vibe, at least off the ice.

But if you’re looking to furrow the new Bruins coach’s brow quickly, bring up his team’s penalty kill. It concerned him back in the summer before he ever put whistle to mouth and it concerned just a few days ago as opening night looms.

It’s no secret why. The B’s, once a standard in the PK department, fell to 24th in the NHL. On top of that, they traded away three players who had been stalwarts on the kill – Brad Marchand, Charlie Coyle and Brandon Carlo – in the retool. Considering the edge with which they want to play, coupled with the fact this team will be challenged to score goals beyond David Pastrnak and Morgan Geekie, having a strong PK is paramount to any succe

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