That's the usual set up on movie productions, but in a television studio they have 3 cameras. One on the left, one in the centre and one on the right. The camera on the right shoots everything on the left and the camera on the left shoots everything on the right and the one in the centre usuallu stays on the presenter. If you watch a programme in the UK called 'Have I Got News For You', they use the above set up. Panelists on the left and right and the presenter in the centre. The vision mixer then cuts between the three cameras giving a variety of shots. On movie sets especially where an explosion is about to be performed and say it would take too long to put a building back together again, then multiple cameras are used to capture the action from multiple angles as in The X Files Movie.

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All done without the aid of a safety net...