What if he says left 2 o'clock? You would be surprised how folks can get their left/right confused in a time of stress.
I would not be surprised at all. Equally, people mix up 10 o'clock and two o'clock and east and west. We aren't machines. But if you say left 2 o'clock the person you are addressing will realise immediately you have made a mistake. It is belt and braces. Or not.