[Karen doesn't necessarily need to see much to be concerned about Frank. He's a walking concern, someone for her to always worry about. And right now, she's well aware that she needs to be concerned about his hands. As much as it distresses him to watch her struggle, it equally distresses her to watch him harm himself to try and help her. While his back is turned, she tries roughly tugging back. There's a small sound of pain as she uses all of her strength, and doesn't manage to do anything but make her arms feel worse.]

The doors must be malfunctioning like the fabricators. There has to be a larger mainframe somewhere that has the master controls and power to everything here.

[It's really the only explanation in her mind. And guess why she's decided this must be true?]

It's like the perimeter fences on Jurassic Park. You've seen that movie, haven't you?