I can finally say I'm superior to the Duel bot
Also, I think I found a sorts of a glitch that make beating the Duel bot kinda broken and easy
-first, if you duck close to the enemy right before it does a top down swing attack and defend it while in duck position, you will be able to instantly kill it every time, only condition is that you have to be right in his position and do the attack fast, but other than that it's a piece of cake, I don't know if it's with all difficulties because I only experienced this in the Duel bot.