After a
certain point in the story Christine begins taking control, getting a better grasp of what's happening around her, and that works so well onscreen
due to the script and also thanks to Kidman's performance.
Furthermore the realism is to a
point that too many leg kicks inflicted in a
certain area of the leg will result in the fighter limping, bruising, not being able to kick with that leg and potentially having the fight stopped
due to lack of movement, while facial expressions show signs of pain
after taking a heavy punch or kick to any area of the face, body or legs and in reaction to blood obscuring their vision.