I was climbing a pretty sketchy willow the other day that had 2 questionable trunks apart from the still healthy main stem. Tied into the main one I was still tied onto the dead guys with my lanyard as I crawled out on them. What if the same concept of the chainsaw break away lanyards was put into a lanyard for doing work like this on dead trees. Strong enough to hold a climber in his work position but weak enough to snap if a larger force was applied. Maybe it already exists but I haven't seen it.