An arsonist, a snitch and a sketchy man walk into a bar.

It sounds like the beginning of a bad joke, but "Prove It" told a much bigger story: it was all about the men and women who hide behind their masks.

The arsonist continued his ring of fire – even going so far as to burn down Mills’ family’s restaurant – and it became obvious that a firefighter was committing the crimes. It makes complete sense when it’s placed in the context of Severide’s car being torched: only a firefighter could really get away with that in front of a firehouse.

Severide’s baby drama was resolved as well after getting slapped and later acknowledged by Renee. Her one night stand with a man in Europe was a quick resolution and it makes me wonder if things might have turned out differently had Sarah Shahi not gotten a full-time spot on Person of Interest.

Nevertheless, Renee tried to hide behind her feelings. She knew Kelly is a stand up guy and would do the right thing and she convinced herself that the baby is Kelly's. I can’t blame her. Having a child is huge and two or more adults is usually better than one. Renee wouldn’t have to deal with being a single mother if Kelly never asked (or never noticed if the baby was his or not). Her situation is now more difficult.

Jeff is already proving useful to Forbes (who is getting nastier and nastier). She quickly threw the station under the bus for letting Darden’s children have a go on the ladders. It’s unfortunate that Mills’ observation of Jeff being on edge was quickly chalked up to being jealousy for taking his spot on Rescue. And with Mills being on thin ice already after running into his family’s burning restaurant, his viewpoint probably won’t be taken into consideration soon.

Forbes really does have it out for Station 51. Her short list for houses to close doesn’t feel like a list at all, but just a single minded focus of closing down the one house that doesn’t stoop to her demands at every level. While she’s only trying to do her job she’s not taking the time to see what the job entails from the men and women who are actually doing it. What makes her actions even more vile is using the anonymity and the threat of firing to keep Jeff under her thumb.

Casey’s situation with Heather’s kids became slightly more permanent after she took the plea for 15 months of jail time. Casey’s always wanted children - and now he’s got two. This situation of his is simultaneously pulling Dawson in and pushing her out. She’s always pining after him and seeing him with children probably isn’t helping her push away the ideas of what could be. But Dawson does agrees with Shay that her life should not begin and end with 51.

The moment the entire house stepped up to help Casey with the kids was a classic Chicago Fire Season 1 moment. I’m happy to see with all the expansion the show still remembers where its core is.

Like any good workplace show, the man Dawson is going out with is totally sketchy when alone. The guy is casing the place, biding time until he can strike a bar that is already in trouble. Dawson shouldn’t leave her keys out either; especially with a guy she’s only known for an hour.

While Mouch is the one who is running for Union President, Hermann is the guy who really knows his stuff. It shouldn’t be long before we see a switch between them. It makes sense, Mouch is better suited as a behind the scenes guy. He knows the facts and he has wisdom behind him to make smart decisions. Public speaking and putting himself at the front lines of bureaucracy is not in his skill set. He’s very good at representing and fighting for his fellow firefighters in smaller settings.