Transient unconsciousness: trivial or terminal?

You have fond memories of going to the snow with your family when you were a child. The getting there was as much an adventure as the skiing and the living in a small community in the snow. So when one day, while you are working as a GP in the local emergency department, the boss asks if anyone can fill a gap in the roster of doctors at the ski resort you used to visit, you jump at the opportunity, even though it is at short notice. That was a couple of years ago – you seemed to have passed the test as you now get invited back each year, and your emergency department experience seems ideal for it.