Not much you can do in that situation. If you can move, do so no matter how badly you want to catch your breath as safety trumps always; crawl if you have to. If you can`t move due to serious injury, yell out to anyone nearby or to someone on the chairlift. Often a message can be yelled to an approaching rider that a person is down.
If you see someone down and not moving, yell out a warning to people above, or if you are in the park, block off the feature by laying your board accross the top of the jump. If on skis, make an X with them on the top. Never just ride by someone in this situation; as riders and skiers, we all should look out for one another just a little bit. Not only could you be saving someone`s life, but it might be your ass on the line someday and a little good Karma might come in handy!
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