Fight takes place in an open field similar to Mifune and Black Star's first encounter. Zoro has his 3 swords and Mifune has all of his. Character morals are on and they both want the win. They begin 50 ft apart and win is by death or incapacitation.
@FuhrerRoyMustang: If Black Star beat him Zorro could. oh but this is arlong saga Zorro, hmmm could go either way but i think Zorro would still win. He would probably be on the brink of death but his great resolve would make him win like it has in many cases.