This picture illustrates what I was trying to show to Stephen. The second one I think shows what Butch is talking about, moving the friction device around the tree to move the rope out from under the piece.
Here is a picture from "The Art and Science of Practical Rigging". Where I find it useful is when you are using a rigging point that isn't real strong. Putting a second pulley back at the trunk of the tree redirects the stress down the limb toward the trunk instead of straight down.
The time it happened to me it broke the rope and a 1000 lb. or so limb fell to the ground, but didn't break anything. Yeah probbaly the only way to avoid it is to put another pulley in the tree.
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