Had a similar but very much scaled down experience when I was very young, maybe five. My family occasionally visited this one park in San Diego where there was a steep trail up essentially a jumble of shattered rocks. I don't know its name.
Given my age at the time I'm sure it was no where near so tall as it seemed at the time. Anyhow, my two years older brother and I were scrambling around off the trail on some bare rocks below which was a clear fall which I suspect might have been fatal. We were out on some smooth rock with a thin layer of grit when my brother slipped and started sliding down the rock to the edge. There was one crack with a little dirt and grass in it which he succeeded in pulling out without stopping his slide. I was still standing nearby so I extended my hand and he pulled me down with him. But I was able to get my little fingers into the same crack and hold on. So he climbed up over me and we both went back down the 'mountain'. To this day, if I bring it up, he still remembers and he hates it that he needed his little brother to save his ass.
I too suffer from over confidence in myself.
Given my age at the time I'm sure it was no where near so tall as it seemed at the time. Anyhow, my two years older brother and I were scrambling around off the trail on some bare rocks below which was a clear fall which I suspect might have been fatal. We were out on some smooth rock with a thin layer of grit when my brother slipped and started sliding down the rock to the edge. There was one crack with a little dirt and grass in it which he succeeded in pulling out without stopping his slide. I was still standing nearby so I extended my hand and he pulled me down with him. But I was able to get my little fingers into the same crack and hold on. So he climbed up over me and we both went back down the 'mountain'. To this day, if I bring it up, he still remembers and he hates it that he needed his little brother to save his ass.
I too suffer from over confidence in myself.