Understanding Your Rooster
About halfway down you'll see where the article starts getting into causes of aggressive behavior to humans, emergency measures, etc. Lots of great wisdom in there. Hope it can help you out!
Good thread Here regarding some rooster advice. I got tremendous help from reading Shadrach's articles, although I have not dealt with a bird persistently demonstrating aggressive behavior as it sounds like your guy has. I have caught my rooster mid-air before and held him, which surprised him...