I felt that when I went cliff diving, i got to the very edge of a 50 foot cliff and I had to lean off to dive, I couldn't get my legs to push myself off.
Did you go again? Easier the second time? I went walking across an old wooden train bridge this summer with a 60 foot drop underneath. It took me awhile to get my legs to move but after several attempts, I was finally able to actually walk down the middle of it. It was quite the rush!