This was a rather cold and dark episode of Person of Interest, for the most part devoid of any big one-liners or jokes and instead focusing on the more serious side of making mistakes and making amends. We also learned about the potential downfall of the Machine.

It's been a while since Fusco has received central focus. He's been around, popping in to help out here and there, occasionally facing off with his past HR buddies, but his past finally caught up to him.

It was great to finally see his first descent towards the darkness starting off small and coming from a real place. Fusco was down, dealing with his family problems and the one cop who was there for him called in a favor before it all snowballed into an out of control scenario where Fusco was killing, lying and stealing. And yet, through it all, you could still see that he wasn't enjoying the path, he was just too far gone to find his way out.

Yet we've seen - ever since Reese first "recruited" him - that Fusco's been working hard to be the good guy and to redeem himself for past mistakes.

Except it wasn't Reese or Finch that came to save him again. Instead it forced Carter, the cop dedicated to abiding by the law and never really crossing her moral line, to make a major decision for both Fusco and her character.

I was glad that she struggled with the choice because it stuck true to her character, but at the same time allowed her to see beyond the black and white of good and bad. It was such a brilliant moment when Carter and Bear walked out of the police office leaving a trail of dirty footprints behind.

I don't think Fusco is in the complete clear, but it's great to see that he does have people who care. This is a guy you just want to root for.

On the flip side, "In Extremis" allowed Reese and Finch to deal with a person of interest caught in a dirty web of deceit and betrayal. The doctor, who had failed at his family where he succeeded in his work, was a tragic tale in the sense that he wanted to make up for his mistakes and face the person who murdered him. And yet Reese wasn't able to save him.

What a wonderful shot of Reese standing in the archway, picking up the fallen glass from the dead doctor. Even the dark and faded colors in addition to the snow added to the mood of the hour.

While the case itself wasn't the most exciting or heavily focused on Reese or Finch, it did provide some great repercussions.

This was the third person behind Szymanski and Beecher to meet their demise instead of being rescued.

Something is clearly wrong with the machine, which was made especially evident in the closing moments of the episode.

I'm really intrigued as to what this problem with the machine will mean for Reese and Finch's work as well as what the virus will change for this super powered computer.

The storm is definitely here.

This was an enjoyable setup for what seems to be a major final two episodes, delving into character, a case of the week and the larger stories that have been interwoven throughout Person of Interest Season 2.

Sean McKenna was a TV Fanatic Staff Writer. He retired in May of 2017. Follow him on Twitter.