That type of defense takes time to learn. If you notice, James Toney didn't fight that way at the start of his career. It took him awhile to perfect it, and he had Bill Miller (the most underrated trainer maybe of all time) working with him. You have to be very, very comfortable in the ring, not getting riled by fists flying around your head. You need to understand that you want the punch to miss you by the slightest possible distance, by making the least possible movement, be it a slip, a duck, or a parry, because that keeps you in postion to punch back. So you have to have engrained in your mind and your body that when you make them miss, you counter, never one without the other. And that means you have to have perfect balance and know how to punch short and hard with both hands. There is a lot to fighting that way.