Honor Before Reason: Leo's family can only watch, even when it looks like he's going to lose his life. Not that they don't want to help, of course...
Locked Out of the Fight: Leo's family are physically stopped from helping him/getting involved by a water cage. What's more, if Leo refuses, his friends and family's lives are 'forfeit'.
Meaningful Echo/ Foreshadowing: At the start of the episode the Turtles, Master Splinter and April and Casey are watching a western: 'Rio Gato'. The theme of the movie is that a young hothead challenges the sheriff to make a name for himself, for 'fame and glory'. Guess what The Ultimate Ninja challenges Leo for...
Meaningful Rename: The Daimyo's Son calls himself "The Ultimate Ninja” after he believe he's defeated Leonardo.
No Time to Explain/ Another Story for Another Time: When the Turtles ask Master Splinter what's going on, he only replies 'I'll explain later. Now is not the time'. Again, at the end of the episode, he simply states 'Be patient. When the time is right all will be made clear'.
Sore Loser: The Ultimate Ninja attempts to kill Leonardo after being officially defeated.
Trying to Catch Me Fighting Dirty: The Ultimate Ninja is more than happy to comply with the rules of combat that benefit him, such as excluding Leo's family from the fight, but when he's losing he has no problems in outright cheating to win