A beautiful episode with so many action and so many critical cases. Such a good motion and movement.
The main thing was the man, who we saw last episode, taking down everyone who had connections with his son. Starting with shooting kids, then his neighbor, then going after social worker and.. Elizabeth. To add that worry about Elizabeth well fare into this episode - it was good addition. Brought up Romano's good sides and adding much more tension.
And the way those cases were handled and on the back stories between Abby-Luka-Carter and Cleo-Benton. It looks like so much left for coming season.
Plus the last scenes on elevator - I do not know what to say. I understand Mark and somehow it was brave but somehow...