With the information I just gained, I let a blow graze my left arm. It hurt like hell, but it allowed me to counterattack. From what I could also gather, his joints seem to be less beefy, to ease the agility of the body. Surprisingly, the nape had a chink that I can insert my sword in(Not that way) and his armpits had lesser defenses. Taking advantage of this, I struck both of his armpits, one with the sword's pommel and the other with a punch.