2:09 p.m. on August 28, 2012 (EDT)
I tend to NOT climb with anyone using a Grigri, simply because so many are taught the wrong way at gyms and tend to develop bad habits. You often hear that a Petzl Grigri (or Trango's similar Cinch) are "automatic belay devices" or that they are "foolproof" (or "almost foolproof"). Petzl and Trango are very adamant that such devices are NOT "automatic" nor are they "foolproof". Over the years, I have been asked by reps and tech people from both companies to emphasize this in the climbing and climbing instructor courses I teach. There are plenty of wrong ways to use such devices, and accidents involving serious injury and deaths have happened in gyms and on rock due to wrong use of such devices. Both companies emphasize that there is no truly "automatic belay device". There are a couple of devices intended for soloing and braking devices that are used at gyms and portable towers that will provide a relatively slow lowering (they do not stop falls).
I have seen a number of dropped climbers in gyms using grigris. There are a few people I will climb with using grigris, but only because I have observed them over a period of time. And yes, I personally have Grigris (both original and Grigri 2), a Cinch, and a couple of solo self-belay devices. I am well aware of ways to screw up on all these. And, yes, like Erich, I learned using a hip belay, and I have climbed with people who used a standing shoulder belay, used figure 8s, carabiner wraps, carabiner brakes, and brake bars, plus make a lot of use of the munter hitch (a rope hitch that should be part of every climber's quiver of techniques). We used many of the old techniques (which were pretty new then) because we didn't know any better.
Here are two videos from Petzl on the right and wrong ways to use their Grigri
- http://www.dailymotion.com/video/x50vsu_grigri-belaying-the-leader_sport
- http://climbinglife.com/tech-tips/safer-gri-gri-use-video.html
An important thing to note is that the hand position for the brake hand is the "new technique" in the second video. This "hands down" method has been strongly recommended for tube devices and figure 8s as well as the Grigri and Cinch for over 15 years now. Yet you still see people using the "hands up" position ("Classic technique"). The biggest problem with the "hands up" position is that you can end up in the "praying hands" position, aka "parallel ropes", which gives virtually no braking, even with a device like a grigri. The "classic technique", hands-up position was used originally with Sticht plates and tube devices early on, simply as a carry-over from how we placed our brake hands when doing a hip belay. The new devices from the Sticht plate onward call for the "new technique", hands-down, so you are always in the position to provide the sharp bend around the belay device (tube-type, Grigri/Cinch, or munter hitch) that provides the controllable friction.
The most wide-spread bad habit I see in gyms and even in sport climbing areas (aside from the "hands-up" position) is the belayer with a hand resting on the release lever with it extended. This is apparently (according to both Petzl and Trango) THE most common contributor to gym drops. Sounds like this was a contributor to the accident described by the OP. Note well that in both the Petzl videos, the recommendation for lowering and fast feeding for a rapid leader is to squeeze the whole grigri.
As an ending note, no I am not overlooking or forgetting the different approaches used by spelunkers, slot canyoneers, and industrial workers.