Glad to hear you avoided serious injury. Happens fast.
I've fallen twice...and it's scary. I wasn't hurt either time, but could have been. Just had the wind knocked out of me.
I had a kid in school last year that fell when his stand came out from underneath him. He had his belt on, with a couple feet of slack in it. When the strap came taught, he swung back into the tree and his highest step, which was actually beside the stand, impaled his left nipple and nearly punctured his lung. He tore one hell of a gap in his chest.
He lost his nipple (they're useless anyway

) and received about 100 stitches.
OUCH!