Big changes happened for John Diggle's (David Ramsey) storyline this week on Arrow, both good and bad. On the good side, Diggle finally resolved some of his ongoing issues with his estranged (and, until recently, presumed dead) brother Andy (Eugene Byrd). On the not so good side, agents of Shadowspire killed Amanda Waller (Cynthia Addai-Robinson) and left A.R.G.U.S. without a leader.

David Ramsey on Arrow

Add on to that the ongoing issues with Damien Darhk (Neal McDonough), Felicity's (Emily Bett Rickards) paralysis the drama unfolding in the past on Lian Yu -- plus the mystery person who's buried in that grave in the near future -- and there's a lot to be concerned about on Arrow.To break down the events of "A.W.O.L.," Ramsey hopped on the phone to discuss what Waller's death means for the Diggles, tease why Damien Darhk's upcoming storyline is so unique and preview his upcoming crossover with The Flash. Turns out Diggle will be getting a new helmet in the near future.

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Yes, they are invested. Lyla's part of A.R.G.U.S. That's just the way it is. Diggle, as we've seen in last season and the season before than and even this season, has kind of become part of A.R.G.U.S. in the sense that he has gone on missions with his wife. He was even abducted at one point by Amanda Waller to do a mission for A.R.G.U.S.He's become a part of A.R.G.U.S. reluctantly, and a big part of it has been because of his wife. This will provide a place of conflict. It already has and it will continue to because he just doesn't agree with the methods. Any organization that's willing to put explosives in the backs of heads of convicts in order to get them to do their bidding just isn't the way Diggle likes to administer justice. He doesn't agree with their methods in general.But I will say, in answer to your question, yes, they both are very invested in what happens to A.R.G.U.S. next -- personally invested, and we will get into that. Part of it will even go over into the story of The Flash in how they become involved in A.R.G.U.S. Much of the reason why they're even in Central City is because of their investment in A.R.G.U.S. They're very invested in what happens with that organization.That's a great question. The natural conclusion would be that these two people are invested to some degree in A.R.G.U.S. I don't think it's a far stretch to say that they made the trek as A.R.G.U.S. representatives to Central City. They are invested to some strong degree in A.R.G.U.S. That's as much as I can say about it.That's more of an Andy storyline. Of course, it does connect to Diggle. Ultimately all this is just how it connects to Andy, connects to Diggle, connects to Oliver, connects to H.I.V.E., connects to Damien Darhk. As I'm looking at the future scripts and what you haven't read, I can say that all of this very quickly gets back to Damien Darhk. That's really the crux of it all. There's time spent on it, but we get through that beat very quickly because we really want to get back to Damien Darhk.Well, there's magic, and you guys know that already. I think where and how this magic comes from is a very, very interesting story. That's about as much as I can tease without teasing it all. I can say that how and why this magic is, the crux of it, is a very, very interesting story. I don't think we've ever seen that before. First of all, what Damien Darhk is doing we haven't seen before, stopping arrows with his mind. We just haven't seen that. How exactly that all works, the story behind it, is a very fascinating one.This show never hurts for stories, right? It just doesn't. We're in the fourth season and we're getting to the man that we met in the first season in John Diggle, why he was so damaged over this faceless brother. We're just now getting that in the fourth season. Why? Because there's so much story to tell! You can take one of the characters and spend half a season on any of the characters on Arrow, and that's a great credit to this show.I would say that to some degree [Andy is set aside], but not greatly. Now you have Felicity in a wheelchair, now you have a wedding, you have somebody in the grave. There's a lot of story to tell. I wouldn't call it sidelined. Every week there's an A and a B story. There will be some episodes where Andy might become less of an A or B story, but he will be there until the story's worked out.When I first thought about Andy, I thought he was just some nefarious dude, but now with the shades of grey and things, I don't know exactly where they're taking Andy. I really don't.I can say this: Central City will be working on an upgrade to Diggle's helmet. That is yet to come, and we will be seeing some of that come out of Central City. As the first iteration came out of Central City, we will see an upgrade also come out. But in terms of Central City's help with technology to help us combat the magic, that has yet to be seen.I have not seen it yet! I have not seen it. Listen, there's two things I'm anxious about: my helmet, and who's in the grave. The rest of which I'm cool with.

Arrow airs Wednesdays at 8 p.m. ET/PT on The CW.Terri Schwartz is Entertainment Editor at IGN. Follow her on Twitter at @Terri_Schwartz