In August, a wind storm split this black walnut's leader. The leader broke again higher up, and came completely off, but a large part of the main stem (lower down) is still attached, and although it's fallen and rested on a nearby tree, the cambium is still green.
This is about 22 feet above ground level. The tree is 9 years old (grown from seed), and has grown very fast. I'm guessing that's why the leader split.
What are my options? I'd prefer to have a central leader growth habit if possible, as these get quite large.