I was wondering that too and I think it might be because from below, they were not expecting him to go off that cliff. Who knows though, maybe they are saving it for a movie.
And to the guy asking if it would be the same force no matter what height: you are right but this cliff is not high enough. I had to look it up but the height to reach terminal velocity is over 500m (source:http://answers.google.com/answers/threadview?id=124248
). So, once someone hucks a 500m cliff, the would be able to huck anything.