How safe is it to use a PAS?
So I’m trying to self-teach me on how to climb multi pitch, I have practiced making an anchor point (a proper one obviously) and also on how to belay with a reverso on guide mode and all that but this is what I have seen from other people: a lot of people ask for slack and even undoing their figure eight while being held only to ONE parabolt, the problem here is that obviously, if the PAS fails the person belaying at the top will just fall to his death, is it supposed to be used like this or is this just a beginner mistake?