He tells Billboard: "Jack is a guy who's been fighting for years, so everything is really efficient. Everything he does is real small. You pull a knife out, he'll walk up, take the knife and break your neck. And so it's all close quarter, highly efficient. He's not into killing you. He just wants you to leave him alone. Break your neck, maybe eat your arm.

"He's just a thing. He takes his carcass, throws it in a chair, makes it watch TV. Because eternity, for him, sucks. He was done a thousand years ago. But he can't die. He's furious, he wants to go, and that's his existential crisis and what appealed to me most about the character."