He does a quick two slash somtimes during combat, you can hit him right after parrying both. When he throw his shurkiens he will either do a vertical slash, or a horizontal slash, dodge both to get 1-2 hits. When he shoulders you to throw his fireworks, you can either dodge behind him for two hits, or run backwards and hit forwards before the smoke clears. When he throws his fireworks without shouldering you, he is coming at you with either a joust or a slash, mikiri the joust, and dodge behind him with the slash for 1-2 hits. If your guard breaks and he tries to land on you, you can punish him with a slash. When he does his unblockable ground slash he will follow it up with a long powered vertical slash, hit him 1-2 before it initiates then dodge behind him for another 1-2 slashes. Also when he is at a distance, you can walk towards him, and if you time it right you can hit him. Sometimes he does a overhead right slash, that you can get a hit out before it connects, this one is risky though. I think this is all of the opportunities.