Part of the enjoyment of a roleplaying game is the game part. Manipulating odds in your favor until you roll the dice and win or lose. For that to work (for me and my firends, anyway), there has to be choices and a genuine risk of failure. The result of the failure doesn't have to be death, but it must be something the players care about. But if the only choice is to jump or not to jump and the consequernces of jumping is going to kill your character sooner rather than later, there isn't much gaming involved. (This, incidentally, is why I dislike Horror RPGs).
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