Not sure,
@Daniel, this might relate to a thread I think you may have started that asked the question "How often do you put your life into the hands of your ground man?" It seems like we're missing a lot in the way of facts about this incident, but I think a couple of people in this thread have implied that it relates to a problem in lowering the load. So this guy may have made the mistake that you were arguing against in that other thread I mentioned. That of putting a ground man in a position to maim or kill you.
I will say right up front that I do not have enough experience to know whether it is always possible to set up rigging in a way that keeps the climber out of harms way, or not. I've seen some people express the sentiment that having a good ground man running the ropes makes the team so much more efficient, that they have a hard time even thinking about the possibility of doing self-lowering. The guy who says that, though, is in my mind admitting that he does put his life into the hands of the ground man, and often.
I mostly work alone, and do my own lowering when the stuff can't just be tossed. Most of what I do is really small, just pruning. The one time I did have to lower some sizeable wood, I had an inexperienced ground guy with me to do the lowering. Fortunately, I had set my rigging up in a way that would cause the wood to swing away from me. No matter how hard I tried to explain what I wanted to see the ground guy do, when the moment of the cut and swing happened, he locked the rope up and held on for dear life. I guess he got excited. But it happened every time, and all the talking in the world could not get through to him.
So, my point is, having experienced this little bit of a situation with my ground guy, I can easily see how much trouble a climber can get into, and how quickly, by trusting that a ground guy A.) Knows what he's doing. and B.) Understood exactly what it was you were trying to ask him to do.
Hell, even after my ground guy locked up the rope, and the wood was swinging back and forth near my own elevation, I had to tell him three times to "Lower it!", Lower it!", "Lower it!" before he would comply.
The only thing that kept me safe was the fact that I had offset my rigging point so far away from me. That and the loss of energy as the swing progressed.
Anyhow, too long-winded again. I guess all I'm saying is that a really good rope man is worth his weight in gold, and you climbers that trust them to do right by you every single time are some bold individuals.
That is all.
Tim