'Person Of Interest' Season 4 Spoilers: Twitter Reacts To Jim Caviezel, Amy Acker Root Finale!

The Season 4 finale of Person of Interest aired on CBS. Twitter had lots to say as Finch (Michael Emerson), Reese (Jim Caviezel) and Root (Amy Acker) went out in a blaze of glory as the heated battle between two Artificial Intelligences, Samaritan and The Machine, took a shocking twist.

In our previous recap, Team Machine found themselves in two different wars. Reese and Elias (Enrico Colantoni) were both captured by rival, Dominic (Winston Duke). While Shaw was being taken to a different location, Root (Amy Acker) and Finch found themselves trapped in Samaritan's base. In order to save them, the Machine gave up its location to Greer (Joh Nolan).

In our recent recap, Fusco arrived in the kick of time with the calvary and arrested Dominic and Elias. While Control's men were looking to prevent the bombing of the Supreme Court, Root and Finch discovered the Machine was dying. In order to save the Machine, Finch had to download his program into a portable computer, inside a briefcase. Time was running out as Team Machine was trapped inside, surrounded by Samaritan's agents. 

In the closing minutes, Root realized they had two clips left and their briefcase was running low on double AA batteries. As Samaritan's agents took out Elias and Dominic, Greer's men put a bag over Control (Camryn Manheim)'s face and took her hostage. As Pink Floyd's Welcome to the Machine started playing, Finch walked out, with no gun, alongside Reese and Root as they started shooting at Samaritan's agents.

In an interview with IGN, co-showrunner Greg Plageman discusses the cliff-hanger, "Well, Samaritan's not easily defeated. [laughs] I think the thing you take away is that the triumph for our guys here is that their backs were against the wall and they managed, together, to save the Machine. And I think what that sets us up for, in a really fantastic way, is how are our guys going to possibly reconstitute the Machine? How is Harold Finch going to go about bringing his Machine back to life? Not even just with it perceiving numbers, but what powers does he want it to have going into next season? We think that's a really interesting dilemma."

Check out what Twitter had to say:

@nieseryjna tweets, "Wow intense end of season on POI... Awesome! So, season 5 starts when? @PersonInterest #PersonOfInterest"

@eugenio_g7 loved the musical interlude, "They actually put "Welcome to the Machine" in there. I freakin' love this show. #PersonOfInterest"

@furby786 states, "@POIFUSCO #PersonOfInterest thank you amazing show and you amazing work here's to many more adventures with #TeamMachine

@simon77chan quotes the show, "Anything you need you can have, no explanations necessary. You saved my life." #PersonOfInterest"

@11anass07 adds, "#PersonOfInterest #POI final episode it's just AMAZING there's nothing like this final it was magnificent with the Pink Floy at the end :D"

Amy Acker herself gave thanks to the fans, "@AmyAcker Thanks so much for watching! We have the best fans! Thanks to our amazing crew and everyone who works so hard on the show!#PersonOfInterest"

We anxiously await to hear if Person of Interest  will return for Season 5 on CBS.

Readers, what did you think of the fourth season finale?