Jaime doesn’t see Tyrion in this moment, but at least he definitively knows, from his conversation with Olenna Tyrell, that his brother did not kill Joffrey.

I don’t think Jaime ever thought Tyrion did, but he didn’t know that he didn’t, if that makes sense. I don’t think he believed it. But they didn’t know who did it. And it raises a question of who can he trust?

Will it change anything? Will he ever get a chance to tell Cersei about it? Jaime’s always been on the fringe of this whole game of thrones, if you will. I think he’s getting to the place where he’s questioning, What’s the point of all this? Power for the sake of power? The times when he functions the best is when he has a purpose, when he’s on a battlefield. Like when he took back Riverrun, he did it in a smart way. Instead of just using blunt force, he can find the weakness in a person.

He’s such a great military man, but when it comes to Cersei, he’s just flailing because he doesn’t have that same level of cynicism, or that ability to lie, like Cersei, Littlefinger or Varys. They operate in a parallel universe. What is the endgame? When you see Cersei with the banker, it’s all about how she wants to control everything. It’s never going to be enough for her, no matter what. And it’s a tricky situation for Jaime. He’s more romantic about that whole relationship, and she’s not that romantic. So how will she react to all of this? It’ll be interesting.

We leave Jaime drowning in his armor.

It seems impossible to survive that. Luckily, he’s not wearing the Kingsguard armor, which is made of brass. But oh my God, don’t get me started on the water! We had a full day of going to the bottom, and that was not nice. I got a little sick, after. You have to go down, you have to equalize the pressure, and I’m not very good at that. It was just a tough, tough day.

Also, as you can imagine, because you can’t see anything when you go underwater, you depend on these divers to come to you when you signal, and you always want to have the feeling that you can escape if something happens. But because of the armor, I couldn’t. Once I let go, I couldn’t do anything. It was a great test of what level of claustrophobia I have, which turned out to be quite high. [Laughs] It’s funny, because it’s all in your mind. In my mind, I know safety is paramount and people are ready, but when you can’t see, and you can’t move, and you feel the pressure of the water? It was … absolutely disgusting, to be honest. But it looks amazing!