After hiding behind you, you can cut him with a knife. Cut two or three knives and you can run away and distance yourself. Don't let him throw an iron ball at him.
In this way, after many cuts, his iron ball chain was cut off. At this time, his speed has also become faster, but it is still very easy to play. Might as well cut it twice and then dodge.
As long as he is ready to throw an iron ball, he must dodge, and then come close to him and cut it twice until he is knocked down.