I’ve thought about this scene, one of Arrow’s very best, a lot this season, and it looms particularly large this episode. That’s not just because William (Ben Lewis, who remains a highlight of this season) brings it up when he’s talking to his sister, who never had reason to hear such a speech. “Purgatory” concerns itself with nearly all its characters confronting some internal conflict—guilt, fear, self-recrimination, long-simmering resentment, helplessness, grief, broken trust, the list goes on. It’s not universal—Dinah, Laurel, and William take a bit of a backseat—but the rest are pretty busy. Diggle, Mia, and Oliver are in for a particular workout, though two of the episode’s finest moments belong to Lyla (Audrey Marie Anderson) and Roy (Colton Haynes) respectively. More on them in a moment.

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There are a number of top-tier scenes in this sucker, though the back-to-back double-whammy of Diggle and Oliver and Oliver and Mia takes the cake. The Mia scene, Katherine McNamara’s finest on the show to date, is the big moment to which the episode builds, and it delivers. For my money, however, the winner in a pack of winners is that Digg/Oliver scene, a deceptively simple little showcase for David Ramsey, Stephen Amell, and a relationship that the show’s writers have spent years building. Diggle comes to terms with a possibility he refused to acknowledge in the season premiere, to the team’s detriment: that Oliver really will have to take on part of this on alone. Oliver gets to show his gratitude for years of friendship and that moment of understanding. And most importantly, both realize that just because Oliver may go where Diggle can’t follow, they will neither of them be alone, because brotherhood isn’t about going down fighting together. It’s just about being brothers. Even when they’re alone, they’re alone, together. (Like the trees they stand beneath in that scene, pictured above.)

That realization is underlined by the other big moment contained therein, which is Oliver’s request that post-Crisis, Diggle finds Felicity and to tell her that William and Mia deserve to grow up together. They get to be siblings. Oliver had Thea, and he had Diggle, a brother in his chosen family. They deserve to grow up together, and perhaps their lives will be less painful and lonely if they do. It’s Oliver thinking like a parent, and perhaps more importantly, it’s Oliver demonstrating that he believes the future can be changed.

But it already has been, because Roy lost an arm and Lyla stopped being Lyla and became the Harbinger.

These might just be cool easter eggs for comics readers, but still, the timeline has demonstrably changed. This is good news for the Star City of 2040 (though perhaps not great news for the Glades?). Remember the two great moments I mentioned? Roy’s arrives when he’s talking to Diggle, post-amputation, when he says that heroes make sacrifices, and this just happens to be his. His choice to rejoin the time already meant timeline changes, but this is a big, noticeable thing, and one that seems likely to shape where the character heads in the future. (Legends?)

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As for Lyla, her final scene is great, but it’s the build-up to her taking control of the weapon, and especially the moment after, that hits home. There’s so much grief there, behind the eyes. Oliver (like Barry on The Flash) has been trying to prepare everyone for his end, but Lyla doesn’t have time for that—just one long look at John, and she’s gone. When she’s back, she’s someone else.

She’s not Lyla anymore, because we’re done with ghosts. She’s not here with another errand to run, because we’re done with MacGuffins. We’ve said our goodbyes. We’ve made our peace. It’s time for the end.

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Stray observations