When climbing a multi-pitch route, suppose I am belaying the second climber, using Reverso or a similar device.
It lets me arrange the rope in such a way that when the climber falls, the rope automatically tightens, and the fall is stopped without the belayer's intervention (see picture).
However, some people say that I need to hold the rope anyway.
What is the reason for this requirement? I could come up with the following explanations:
- If I arrange the rope in a wrong direction, holding the rope will prevent slippage
- Holding the rope prevents me from getting distracted
- If I am not holding the rope, it makes me responsible for the outcome of any unrelated disaster
- It's a generalization of the principle "don't let go of the rope", which is true for sport top-roping
However, none of these seems reasonable.