from Joe Starkey of the Pittsburgh Tribune-Review,

The Blue Jackets had no business getting back in this game. Bylsma left the screen door open. Columbus had been dangerous on the penalty kill all season and had scored a short-handed goal in Game 1. There was no reason to take a chance.

Sure enough, Malkin fumbled a puck at the right point. He escaped unscathed. He then was victimized at the left point, which led to a 2-on-1 and Matt Calvert's short-handed goal.
This was sheer Penguins arrogance — and it changed the game for good. They never recaptured control. After outshooting the Blue Jackets, 15-4, in the first period, they were outshot 41-27 the rest of the way.

Afterward, Bylsma explained that he went with four forwards because it worked so well during the regular season. That is true. The Penguins had the league's top-ranked power play. But the playoffs are a different animal. Coaching staffs have way more time to break down opponent's special teams. They look for weaknesses.

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