Every time Seguin touched the puck, boos rained down on the Stars’ top-line center. He may have been wearing a different number, but Seguin had a target on his back for the entire night. Not because he decided to sign somewhere other than Boston. Not because he demanded to be play for another team. Not even because he injured a current Bruin. Seguin was being booed for something he had zero control over: an offseason trade.