Harry could develop a unique style of magic. Rayleigh might encourage him to combine his magic with his physical abilities. So instead of just waving a wand, he could be using his body movements to enhance the power of his spells. This would be a departure from the traditional wand - waving magic in the Harry Potter series.
His magic might develop in a more practical and combat - oriented way. Instead of just using magic for spells in a classroom or dueling, he could learn to use it in the heat of battle at sea. For example, he might learn to quickly cast protective spells while on a ship during an enemy attack.
Since Rayleigh is from a different universe, he might introduce Harry to new ways of thinking about magic. Maybe Harry would start to experiment with magic in ways not thought of in the wizarding world. He could learn to use magic to manipulate the elements in a more extreme way, like creating huge waves to protect his ship or using wind magic to speed up their voyage. This would be a result of being exposed to Rayleigh's different perspective and experiences.
Chapter 236, "White Dew Gu, Despairing Yuwen Dao, Yang Lu", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. It opens with Now that things have come to this, the destruction of Yanglu Camp is... and closes on Great Xia Minister, Xia Chuan, Leader Peng, I'm quite interested in.... The key payoff is that the chapter closes with "Alright, Leader Peng is straightforward.
Chapter 234, "Probing, Arrangements, and Hou Hu’s Confidence", is the clearest early answer because it turns Hou Hu's situation into a concrete plot event. The chapter turns that into something concrete by moving from The strength of Zhaoyang, which challenges the status of Long... to Beehive took a more direct approach, building the station underground....
Chapter 275, "The Stunning Sword Puppet, Vindication, Cloud Dragon Army (Part 3)", is the clearest early answer because it turns Hong Guang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Although this strike was powerful, Xia Chuan knew deep down that it... and ending on With his waist split open, Xia Chuan's body was blasted away like a....
Chapter 225, "Council at Long Mountain, Li Xuanling's Decisive Action (Part 3)", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with This time at the alliance meeting, Wushuang and Hanqiong haven't... and follows through with They both realized something, and looking at Li Xuantiang at the....
Chapter 245, "Cause and Effect, Perspective, Return to the Beehive (Part 3)", is the clearest early answer because it pushes Yuan Cheng into a new phase or setting. The chapter turns that into something concrete by moving from As soon as Xia Hong spoke, everyone's expressions tightened. to Of course, we'll deal with Long Mountain and Zhaoyang, but the....
Chapter 275, "The Stunning Sword Puppet, Vindication, Cloud Dragon Army", is the clearest early answer because it turns Cloud Dragon Army's situation into a concrete plot event. The chapter gives readers a real answer by opening on Xia Chuan's sword puppet is rarely shown in the camp. and ending on The problem is, these two have never fought each other once..
Chapter 235, "The Might of the Longyou Army, Yang Lu's Desperate Situation (Part 2)", is the clearest early answer because it turns Wu Ying's situation into a concrete plot event. The chapter gives readers a real answer by opening on The thousand people on the south side are led by two Cold Resistance... and ending on At the front of the battlefield, a Longyou soldier drew a strong bow,.... In story terms, the chapter closes with Yuwen Dao sneered coldly;
Chapter 293, "The Lion Hunts the Rabbit—Luring and Falling into the Trap", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The setup is Second Year of Great Xia, July 1st., but the pressure keeps building through To the west of Wushuang, Peng Bo rushed from the snowy plains to the....
Chapter 231, "Investigating Yang Lu by Day—Whose Side Are We On?", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. The setup is They are now located southeast of the hill, and the west side happens..., but the pressure keeps building through Below the deep ditch to the south, there hangs a raised drawbridge..
Chapter 220, "Difficult Journey, Yucheng's Predicament, and Li Xuanling", is the clearest early answer because it pushes Long Mountain into a new phase or setting. A useful checkpoint is the way the scene starts with To the west of the Beehive, there is a stretch of snowy terrain that... and follows through with The strength of Great Xia, given this context, belongs to which tier....