Now I am sure there are those out there that would be quite insulted or affronted if asked all these questions by potential caving companions. I am not suggesting that this list be used for such purposes. Caving safety starts at home and this list is something to use on yourself, not to abuse potential friends. After all, whether you like it or not, while you may be able to take care of yourself underground, if the other guy gets hung up it is going to be up to you and your group to solve the problem. And being able to solve those problems is what this is all about.
Nobody enjoys a body recovery.
These have better handling characteristics, specifically being able to ride on the rope without engaging on the rope until needed. This done, you grip the ROPE just as you would normally do on any rappel. The prusik knot rides below your hand and will not engage itself until you take your hand off that rope - like to say, grab your rappel device in panic. But now the prusik safety has engaged itself and brought the person to a halt. This is why you practice and prepare before going into a cave, just as you should with any kind of vertical equipment.