She is trying so very hard to not spring at him. Marion wants to get that crewman out of danger. Let her deal with this asshole. She can take him. Marion is so cocksure of her ability to deal with Khan that his true strength will shock her.

Then she'll smile. But that hasn't happened yet.

"Pretty sure they're already on their way," Marion said with a slight tug at the corner of her mouth.

"Even if they weren't? If you don't let go I'll break your arm and feed it to you. Inch by inch."

She is very calm about that threat.