They broke the fall probably by moving down with her at a slower velocity gradually decreasing the rate of movement as they go down, basically mitigating the momentum. To clarify, the force is decreased because they move in the same direction instead of against. And having multiple people divides the force of impact among everyone making contact, reducing the force put into any single person. Nothing especially metoculous about it. To break an arm, you'd have to be the sole idiot moving in the opposite direction of the girl.
If you don't understand basic physics, you really shouldn't pretend to be a global warming expert.