Short lighting is, as the name implies, the opposite of broad lighting. The main light is positioned at 90 degrees to the camera, pointing at the side of the model's face furthest from the camera, with the secondary light to the other side of the camera pointing at the side of the model's face closest to the camera. Again, the secondary light should be about half the intensity of the main light.
Short lighting is good for low-key portraits, and also has the effect of making the face look narrower, and emphasises facial features such as the nose and cheekbones. Use it with anyone who has a broad, flat face.