Warning: Major spoilers ahead for Sunday's episode of "Westworld."
HBO's "Westworld" turn a dark turn on Sunday's episode, "Vanishing Point," when William fell deeper into his paranoia thanks partly to Ford's manipulations. The devastating misunderstanding led him to shoot and kill his own daughter, Emily, because he believed she was a host controlled by Ford.
But throughout the episode, we also see William feeling around in his own arm — just as Dolores did on the first season when confronting her own reality — as if he thinks he could be a host himself.
Though "William is a host" is one of the more popular fan theories this season, "Westworld" star Katja Herbers (Emily) isn't buying into it.
"He even feels around for a portal in his arm all the time, so I think he's really losing his mind," Herbers told INSIDER. "I don't think he is a host. The moment of him as a human, shooting his human daughter is more powerful for both people."
Keep reading to learn about why Herbers disagrees with this theory, and why filming her death scene required little acting thanks to the painful fake blood mechanism used on set.
Kim Renfro: Walk me through your first reaction to getting that script and realizing what was going to happen to Emily?
Katja Herbers: I was simultaneously pretty heartbroken but also very excited that this happened for the Man in Black's storyline. There's nothing worse he could've done than to kill his own child, so I think it's an amazing turn for the show. I'm more excited than I'm heartbroken because I think it's just the worst thing he could've done.
Renfro: Why do you think this is fitting for William's storyline?
Herbers [speaking from her character Emily's perspective]: Well, my whole journey coming into Westworld was to get my dad out of Westworld [and] to get him certified insane and lock him up. I've read his profile so I know the kind of man he is in the park, and I take that even further and understand that this might not just be his personality in the park — he's been hiding behind being this kind, generous person in the real world.
I don't think I ever thought that he would be that insane. I think he's basically responsible for my mother's death. In an indirect way, I think he did kill my mother. And I think I'm part of that as well — I feel very guilty about it. And I never would have imagined that he would be able to actually kill his own daughter, and that he would be that insane, that he would think that I'm actually Ford.
I would have never gone for that profile card [...] and it's just insane. It's so much, it's heartbreaking.
Renfro: What it was like working with Ed Harris that day?
Herbers: It was really, really wonderful. He's just an incredible human being and an amazing actor, and he was always so entirely present. He was always so there for me in the scenes. I loved him very much while we were filming it, although I hated [William] so much, but I just loved him for being there and for never dropping the ball and always being connected. It was very special.
And then he shot me [laughing]. I had about 40 squibs inside that jacket and luckily we only had to do it once, but that was insanely painful. I have bruises all over my body from that.
Renfro: Can you explain what squibs are?
Herbers: It's these little pockets of fake blood that they control with the remote control and then that explodes on your body basically, so it's painful. I wouldn't recommend it. You don't have to do much acting, because it actually really hurts and you want to fall down.
Renfro: "Westworld" is a show where death doesn't mean what it might on another series, because there are all sorts of ways in which your character could come back. Do you have any indication that we might see more flashbacks or a simulation version of Emily in the future?
Herbers: It would be great, and I would love that, but I don't know. I guess I've been to the park since I was a little girl, so I'm sure there is a copy of me somewhere that they could put into a body. They could also put [Emily] into a different body, if they don't like me as an actor [laughing]. Anything's possible on this show.
Renfro: If you were to return in any of those capacities, is there a certain character that you would like Emily to interact with that you didn't get to on this season?
Herbers: Probably almost every actor on the show, really. I have a very strong personal connection with Shannon Woodward [who plays Elsie], but we are more comedic together, so I don't know if there's like a funny bit that could happen. Probably not.
I would obviously love to work with Anthony Hopkins, but I don't know. It would be interesting.
Renfro: That would be interesting, given how William and Ford's relationship is so contentious and combative, and so seeing William's daughter in the middle of that could be fascinating.
Herbers: It would be interesting because basically I could hold him responsible for my father killing me, if he thought I was him. [Ford] f----d with his brain so terribly.
Renfro: Do you also think Emily could hold Ford responsible for Juliet's death as well? Because he was the one who put that profile into William's hands?
Herbers: I don't think it's the profile that caused [her death by suicide]. I think the profile is proof of why she was in that state in the first place. I think she always knew William wasn't who he pretended to be in the real world, and he's been gaslighting her her whole life. She turned to alcohol, I'm sure she has an addictive personality, because not everyone turned to alcohol, but I don't think this would have been her fate had her husband not gone to the park three months of the year and been obsessed with Dolores and done all these terrible things.
I think she's always felt that darkness, and he's always denied it, and I [Emily] has always taken his side. So I don't think Ford's responsible for that. I don't think everyone who goes to the Westworld comes out as the Man in Black.
Renfro: You said William went to the park for three months of the year —
Herbers: I don't know if that's true, that's just what I had at the back of my mind when I was playing the role. I thought, "This is probably a dad who takes off." Remember on episode six when he doesn't really remember [if it was Emily or Juliet who] liked the elephants?
I saw there were some fan theories saying that must have been a fidelity test. I don't think that's the case. I mean, I have no authority to speak on it, so I don't know, I can just tell you what I personally thought. I just think he's just been a very absent father and I've for some reason put him on a pedestal.
Renfro: It's been really interesting to see the fan theories crop up around William being a host. Because it seems like his paranoia is making William himself think he could be a host, even though the scanner the QA people used cleared him.
Herbers: Oh yeah. In episode nine he even feels around for a portal in his arm all the time, so I think he's really losing his mind. I don't think he is a host. The moment of him as a human, shooting his human daughter is more powerful for both people.
So for my understanding [Emily and William] are both real humans. Until somebody else tells me that's not true, you know? I don't know. They don't tell me.
The second season finale of "Westworld" airs Sunday, June 24, at 9 p.m. ET. For more on "Westworld," our complete timeline of every major event on the show, follow INSIDER's coverage here.
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