On December 28, 2012, Seguin told NBC Sports Boston that, after representing Team Canada at the 2012 Spengler Cup, he would leave EHC Biel and return to the Bruins. In 29 NLA games that season, Seguin scored 25 goals and 15 assists. He also befriended his teammate Patrick Kane, who returned to the Chicago Blackhawks upon the conclusion of the lockout.