Pretty lucky for them, but I can believe the story.
Late 70's, had a HS friend in the military, he was doing a routine parajump and had a streamer. He hit near the top of an earthen dam and rolled down.
Result......broken ankle and a medical discharge. Kinda hard to do your "job" when the landing/running gear is compromised.
If he had hit flat ground, more than likely dead.

Sucks to lose an airframe, great the two of them basically walked away...... it was a, "not your time yet, make every day count" sorta thing.