Question: What happens to your body/brain when you fall from high above in the sky? What are the reflexes?

It’s a myth that we die before we hit the ground – most people will freeze out of terror, but it is the impact which kills rather than the fall.

Check this article out – it goes into detail about it:

https://www.abc.net.au/science/articles/2005/09/13/1459026.htm