There was a part where he starts to really spin over and over and there was a big fear if he spun too much, he would never recover. The spinning could have caused him to black out and never regain consciousness.
Also, this was all going on high up in the atmosphere where there wasn't enough air friction to control his stabilization.
That was pretty freaky.
But he ultimately made it all look fairly simple.
I wonder what he might do next.