This means that your climbing system needs to be in a straight line at all times.
Anchors, belayer, climber; in whatever order the system is set up; always need to be in a straight line.
If things are out of straight line and the climber slips then the climber pendulums across the rock face and these photos show what can happen to the climbing rope, as it moves across the rock face back into a straight line again.
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