 Susan Ward sprained her left ankle in the scene where she rushes  inside the maintenance room after a victim. The scene was put  together from two different location with the actresses actually  rushing inside a small storage room later to be spliced with another  location. When Ward ran into the room, her heel got snagged on a  rubber mat inside the door, twisting her ankle. Some of her scenes  after wards do not show her walking or only standing.