There is two way to read accident in north America: One is to read it from the beginning to the end like a book and the other is to read about a technique, like rap, and to read only the accident where there is a question of rap. You will see that each year, the situation of an accident is very similar, just the context are different.
As you train, you will have to train in rough ground, with a guide, an experience leader or alone where you can control the environment. For example, it is possible to fix an uneven rope in a gym and late people rap from that with some thing at the bottom to prevent injury. If you have a fall of ten feet, you will have an idea of the problem. If you ask to the climber to stop at one feet from the bottom and hang there until the person fall, it will be a good practice...in a gym...to prevent accident.