Actually, someone mentioned earlier in the comments that in that scene, Lene appeared with two other men who were controlling her in case her brother wanted to stop the operation or something, and they were also the ones who pressed the knife against Claire's neck.
Honestly wish they left it like that in the manga too, it makes people dislike Lene more which is kind of sad.
Went back and read that comment. This change seems like a bad call on the manga's part. The way it's framed in this makes it seem like both of them agreed willingly for their own selfish reasons and buckled down when they were caught. Very unsympathetic without the threats and blackmail element.
