Most people are naturally predisposed to intervene with acts like this. In fact, as someone who ideates suicide attempts fairly regularly, I'd also intervene. Call it hypocrisy, but events like this tend to draw out more empathy than many others, for better or for worse. Without context it's difficult to rationalize someone else's decision to kill them self. I recognize that saying this might be a bit odd to say on a pro-choice forum with a strong death bias, but there you go.
All things considered, the attempt to minimize damage is pretty clever. It obviously took a level of intelligence and coordination to pool these guys together, and, as pointed out above, the jumper likely wouldn't have died from this height anyway.
I'd likely argue this is the best result for the jumper, as attempting to kill himself again (if they so choose to do so) would be a lot easier with less broken bones or more severe handicaps.