BOSTON — Moritz Seider has established himself as one of the NHL’s better defensemen in his five seasons with the Detroit Red Wings.

But the 24-year-old German hasn’t done much fighting in his career and it showed on Saturday night when he squared off against Mark Kastelic.

The Bruins’ veteran pugilist roughed him up in a one-sided scrap in the first period on Saturday.

After Kastelic finished a heavy check on Seider in the corner behind the Red Wings’ net, the Detroit defenseman took exception. Seider shoved him once and then gave Kastelic a forearm in the cheek, followed by a gloved hand to the face.

That was enough to kick Kastelic into action. The Bruins forward landed a short left and a straight right before his gloves even came off. Seider tried to wrap him up, but Kastelic

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