At the Dark Horse Rendezvous we went down to do Morocco with a bit of a crowd, spending some time working on deadman anchors at the start. Then we had a mishap at one of the awkward later rappels. And a save by the youth providing an attentive and aggressive bottom rappel. The rappel is off a chockstone with an awkward start. The slot to the side of the chockstone was nasty, therefore the webbing was extended quite a ways, with the ring over the edge, in order to make the retrieval successful. I came up after half the party had rapped, and started chatting with dude(1) who was providing a meat anchor backup, and coaching. Dude(2) was setting up to rappel, which involved stepping over a rock to get into position, grabbing the rope below the ring, rigging the device, then climbing as low as possible to get the weight on the rope. It happened very quickly. Dude(2) disappeared over the edge with a scream. Dude(1) and I jumped forward to view the carnage, but there was no carnage, as the youth was providing a bottom belay and caught the fall, about 2 feet off the ground. The ground was a nasty pile of large boulders. Analysis 1. In a large group, it is good to set up a courtesy anchor, as we had done on at least one previous anchor. 2. Dude(1) was providing a meat backup and coaching. Do NOT engage the dude in conversation when he is already performing an important task. 3. Bottom belays are a good idea when the rappel start is awkward, even when the rappel is short. 4. Perhaps Dude(2) thought he was being (courtesy) anchored by Dude(1). The backup Dude(1) could have easily been mistaken for a meat anchor. It would have made more sense to ignore the webbing and ring, and just give a meat anchor, rigging differently for the Last Person. The geometry was very good for meat anchoring. Short version: Don't Do That! Comments? Pictures: these pictures show a different rappel that has kinda the same geometry, the same problems.