By Scott McLaughlin/DFP StaffOne year ago, Alex Chiasson joined veteran teammates Kevin Shattenkirk and Colby Cohen in the press conference room at TD Garden following Boston University’s 2-1 win over Northeastern University in the first round of the Beanpot.Chiasson had just played one of the best games of his freshman season and he had a game-winning goal to show for it. As he followed the two upperclassmen onto the stage, he copied their every move and repeatedly looked over at them to see how they were conducting themselves.Now, as the Terriers return to the Garden tonight for the first round of this year’s Beanpot, it’s Chiasson, who has a team-high 24 points, doing the leading. Now, it’s this year’s freshmen looking to him for guidance.“They realize that this is an example to follow, that there’s success going on there,” BU coach Jack Parker said of Chiasson. “He’s getting goals, he’s getting a lot of ice time, he’s a real important player to this team and he’s one of the best players in the league. You wonder how he does that.“Well, he does it by working real hard all the time, by coming to practice ready to go, by getting mentally ready to play, by being upset if he doesn’t play well. If he has a bad shift or a bad period, he tries to get himself straightened out and not just say, ‘Oh, it’s not my night.’ I think he’s a great example for the rest of the kids to follow.”Read more at www.dailyfreepress.com.