Flash in this case is any kind of lighting modes be it external flash or lighting stand. Efforts to have lights that work in cat's eye mode are lights that light up when it gets exposed from other Flash. Some cheap flash is only able to work at a maximum speed of 1/200 sekon therefore this should be considered by the photographer.
Ligthing Stand is very necessary in indoor motif, Flash that can be perpendicular from the direction of the model will be very annoying and make the image to be flat. Lighting is required from different directions so that the lighting stand is necessary to change the position of the light against the camera.