In reply to andrewmcleod:
> I have a friend who works at an autobelay only kids climbing thing, and they have to (once per day?) climb up to the autobelay, secure themselves, then pull out the entire length of the autobelay strap to check its condition. This may explain the daisy chain (as well as securing stuck climbers when lowering them together etc).
When I worked at a wall with only auto belays, we used to help people let go on a regular basis! So you climbed the line next to them, stuck your cows tail onto them, and grabbed them down with you! This was not as traumatic for them as it sounds, as it gets them out of their scared place quickly, and you are with them so they feel safer. I have to say this was mainly kids, I would be less inclined to do it with adults.