30 January 2011 Last updated at 11:59 ET BBC NEWS, Glasgow Scotland
Adam Potter, 36, lost his footing at the summit of Sgurr Choinnich Mor near Ben Nevis and plummeted down the near-vertical eastern slope.
Lt Tim Barker, from the helicopter rescue crew, said: "It seemed impossible... he must have literally glanced off the outcrops as he fell."
He said Mr Potter, from Glasgow, was shaking from "extreme emotional shock".
"We honestly thought it couldn't have been him, as he was on his feet, reading a map. Above him was a series of three high craggy outcrops.
"It seemed impossible. So we retraced our path back up the mountain and, sure enough, there were bits of his kit in a vertical line all the way up where he had obviously lost them during the fall.
"It was quite incredible. He must have literally glanced off the outcrops as he fell, almost flying."
The helicopter, f
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