On July 4th, 2013, Boston sent a 21-year-old Seguin, along with Rich Peverley and Ryan Button to Dallas. In exchange, the Bruins received Loui Eriksson and three prospects (Joe Morrow, Reilly Smith and Matt Fraser).
At the end of the season, management held their meetings about free agency where then GM, Peter Chiarelli, was wanting to re-sign Nathan Horton. To do so, the Bruins would have to move out a player.
The consensus was that, although skilled, did the youngster fit into the culture that was built by guys like Zdeno Chara, Patrice Bergeron and David Krejci.