When the Bruins hit the ice for practice yesterday at Ristuccia Arena, David Krejci found himself in the gray jersey of the third line, skating with Benoit Pouliot and Jordan Caron, the same players he centered in the team's 4-1 win over the Capitals on Sunday. It is an unusual spot for a player who is used to skating among the top six forwards and very often as the No. 1 center. But after steaming into the All-Star break on a hot streak in which he notched points in 15-of-17 games, Krejci started the post-break portion of the schedule decidedly cooler. After recording an assist in the first game back against Ottawa, Krejci went pointless in a pair of losses to Carolina and Pittsburgh in which the B's high-powered offense — of which Krejci is a large part — scored just one goal in six periods.