What is the most risky thing your have ever done?

[Grunt]

Also, if he was handgliding he would likely have an expert with him, who would obviously supply the gear - this person would not not allow someone to handglide from that location if there was a strong wind that would have a chance of doing exactly what Gogson claims to have happened.

As I have already stated. Gogson would have survived for one reason. The Glider itself. If he would have jumped off without a Glider it would have killed him but, the Glider would have gotten caught in the air. This would mean he would be going a slower speed then If he were to have no Glider, cushioning his fall.

It's simple Science People!
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It wouldn't have even got that far, see attached video below (not mine btw, just found it on youtube):

https://youtu.be/bS6CEmQuU2w

As you can see, there is a large run up where the wind blows under the hang glider which causes it to take off. At this point there is still plenty of run way left. Gogson was describing running all the way to the edge and jumping off, much like a base jump.

Even IF it got to the stage of being at the edge of the cliff, what you are describing wouldn't happen as there would not be enough lift from the wind under the hang glider to dampen his fall. What would happen is that he would most likely nose dive or fall backwards.