The Atlanta Falcons drafted Troy Andersen in the second round of the NFL Draft this year. But the Montana State alum isn’t acting like a rookie. Atlanta Falcons linebacker Troy Andersen started off slow in his first two NFL games, but the second-round rookie out of Montana State is picking up steam. On Sunday, Andersen played 21 defensive snaps in the team’s win against the Seattle Seahawks. In the box score, Andersen recorded three tackles and should see that number increase moving forward. “We’re bringing him along through some different packages,” head coach Arthur Smith said. “We’ll go through the…