Sometimes simple thrills and basic fears just aren't enough for crazies, so they combine adventures and challenges into a sort of super extreme Frankensteinian dance with danger. That's how we end up with people trying to walk a tightrope connected by two hot air balloons. If you fall, you plummet to the ground (like skydiving).
They fell. No one actually got to complete the walk, but it's OK because from the looks of it, they make it seem like falling to the ground is a pleasant thing to do. Look how much grace the guy with the umbrella has!
This fall was slightly less expected:
Sebastien Montaz-Rosset posted a full video describing what the guys were trying to do and how they were going to do it. You can watch it below: