Woman who was about to be saved suddenly falls off the ledge

I don't know where was this or what was the reason why the lady was there. But it looks like she went there on her own and they have to save her. The crazy thing is how she fell! Looks like the ledge was not able to support her weight anymore since it's not supposed to be something that should endure something heavy. The rescuer seems to act slow, too. I guess they have a safety measure below them in case she falls, too, something that could catch her.