Had a similar incident in my teens.

I was at scouts and we’d set up a monkey swing on a branch next to a river.

While I was on it, I somehow realised the knot on the branch was coming undone and was able to witness its unravelling in slow motion.

The fall was also slow, as I hit the ground I cried out, but more from shock than any pain.

Very luckily I had landed on the soft sandy riverbank rather than the rocks in the river I had been above just moments before.