Since the idol ends up in the hands of a game-winner after each round, and the winner moves more, so it is unlikely, but due to the tile modifiers it is still theoretically possible that the idol gets crushed by the boulder -- i.e. the holder of the idol gets crushed.
In that case, will there be no winner, everybody loses ?
Or a random player (from the tile closest to the boulder) picks it up (prying from the hands of the fallen player just before it gets crushed by the boulder) ?