Let’s be clear from the outset: Skiing and snowboarding are extremely safe activities, even with the inherent risks. Your chances of being killed on the slopes literally are less than one in a million, according to statistics provided by the National Ski Areas Association. But the death of a Massachusetts skier at Winter Park last week made us reflect on what to do in the event of a serious injury. If you get hurt on a busy slope, you’re going to be seen, and ski patrol probably will reach you very quickly.