Brie Larson (right) gives a breakout performance in Short Term 12. I didn’t recognize her from her role as the savvy ex-girlfriend in The Spectacular Now. Her transparency made me forget that she has ever done anything else onscreen. There’s no residue of other roles. Grace has been a victim herself, and it’s dismaying to watch her hold and talk her charges down and then act out at home with her boyfriend, another counselor named Mason played by John Gallagher, Jr. (left) from The Newsroom. Gallagher’s gentle, self-effacing performance is as finely-wrought in its way as Larson’s.