Warning: Full spoilers for the May 31st Person of Interest, “The Day The World Went Away,” below. The 100th episode of Person of Interest was a hugely eventful one, and ultimately a tragic installment that saw the team losing one of their own - even as the Machine took on a very familiar persona. I spoke to Person of Interest’s executive producers, Jonathan Nolan and Greg Plageman, about the death of Root (Amy Acker) in “The Day the World Went Away,” how and why they chose to kill her and how Root lives on, in a way, thanks to the Machine taking on her personality (and voice) for itself. For more on Person of Interest's 100th episode, check out our review, along with our interview with Amy Acker about what occurred. Continue reading…