I have implemented a feature that allows teachers to move posts that are off-topic into a new discussion. Martin calls this "breaking off a branch from the tree". The way it works is that next to the "Show parent" link at the bottom of every post there is also another link, currently called "Prune". If pressed the teacher is prompted for a name for the new discussion and then that post toghether with all its children is moved to that newly created discussion.
My problem is that I am not sure what the best name for the link is. Does anyone have a good idea what we should call it?