Oh my God, what a beautifully written episode that was brilliantly edited and one that was absolutely heartbreaking to watch, especially at the end. This is probably my favorite POI episode ever because it brought back Carter (Taraji P. Henson) in a very clever way to make it organic and not some cheap stunt. Naturally you think "okay, it's just going to be a bunch of flashback scenes.....", and to a degree there was some. But it's the reveal later in the episode that the 'stakeout' we see Carter and Reese on is really an illusion that he is experiencing as he is bleeding out. I thought the editing was fantastic in showing Carter as a rookie investigating a homicide as Reese investigates the same case in present day and how both end up colliding into the reveal. But it's the conversation between both characters that left a lasting impact as it was about regret. Regret in not opening up and sharing a deeper part of himself to her, regret in not pursuing Carter, regret for a lot of things that anyone that watches will relate to. It was great to see them sharing screen time together again, but it was also sad because it was another reminder of what a huge loss her character was once they killed her off.