Go4, I was never on that CLIFFHNGER set but I highly doubt that Stallone was ever in any real danger of falling further than six feet down and landing on an well cushioned, injury-preventing mat.
In 90% of the time in which a possible injury could occur, they would use me or a more qualified stunt double who is made up to look like Stallone because it could cost millions (possibly) if the star was to get hurt and unable to appear in front of a rolling camera until he/she recovered.
All those details are usually always covered in the star's contrct unless things have changed recently.
And if the stunt double gets hurt or dies, you just call up the second on set stunt double .... and the camera keeps on rolling.
Mt best friend of many years ago was one of the top stuntmen in the movie production universe and died during the filming of 'The Sword and the Sorceror', but the real star remained intact and production continued.
More on that story if thre is any interest.
And ... Go4 .... were you simply joking about Stallone's dangerous scenes in Cliffhanger? A damn good movie BTW!
And, oh yea .... Many industry folk claim that Tom Cruise actually does his own stunt-defying scenes .... but I'm still not convinced enirely.
But it is possible that he can make such a decision as he owns the production company so there is no one above him to say, "NO!" ..... I think!