One possible reason could be that he felt he had learned enough magic to face his enemies on his own. He might have thought that the traditional Hogwarts education was too slow or not relevant to his specific needs, like dealing with Voldemort. Another reason could be some sort of conflict with the Hogwarts faculty. Maybe he didn't agree with their methods or decisions and decided he was better off without their rules.
Chapter 254, "Madwoman! She is definitely a madwoman!", is the clearest early answer because it turns Don's situation into a concrete plot event. Early on, Just when everyone thought that Jiang Yan wouldn't last long and....
Chapter 338, "Rapid Progress, Martial Arts Skills, Dual Advance Eastward, Dormancy Period", is the clearest early answer because the violence around Yangxu Tripod becomes final instead of hypothetical. It opens with But in reality, it was completely different. and closes on Anyway, the cultivation issue is solved.. The key payoff is that it turns Yangxu Tripod's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Xia Hong.
Chapter 47, "This Result Definitely Has Insiders!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Qi is actually second???] [Did the production team make a mistake?
Chapter 346, "Formidable Soldiers and Brave Generals, One Against Three, Reason Behind the Beast Tide", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter turns that into something concrete by moving from Subordinate here to receive the order!" After Hou Quan nodded in... to At that moment, the Snowmane King behind also opened its mouth, but....
Chapter 331, "Zhu Shun and Huang Tianxi, the 3rd Year Cold Yuan Banquet of Great Xia, and Xia Yuzong (Part 5)", is the clearest early answer because it turns Cold Resistance Level's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The children immediately lowered their heads in fear, Huang Tianxi... and follows through with At the beginning of this new year, may the Cold Yuan bring well-being!.
Chapter 333, "Silver Mine from the Heavens, Yu Yao and Yu Sheng, No Need to Use a Bull Knife to Kill a Chicken", is the clearest early answer because the violence around Xia Hong becomes final instead of hypothetical. It opens with Wah..." "Lord, don't rush, there's still another child yet to come,... and closes on The Skill Workshop was formerly called the Woodworking Workshop, but....
Chapter 174, "Such a Melodrama, Love Watching It", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 328, "An Unexplainable Unease, Jade Dew Stone, Li Xuanling's Panic", is the clearest early answer because it turns Yangyuan Peak's situation into a concrete plot event. The chapter gives readers a real answer by opening on After the first wave of arrow rain all landed on the North Slope of... and ending on After waiting for over ten minutes, when Yangyuan Peak had shrunk to....
Chapter 335, "Songyang Ridge, Seven Clans Submit, First Shipment of Silver Arrives", is the clearest early answer because it pushes Songyang Ridge into a new phase or setting. The chapter gives readers a real answer by opening on In the past, getting married to a lord was wholly different from... and ending on Even the gate guards of Great Xia had Earth-digging Realm Limit....
Chapter 331, "Zhu Shun and Huang Tianxi, the 3rd Year Cold Yuan Banquet of Great Xia, and Xia Yuzong (Part 3)", is the clearest early answer because it turns Zhu Shun's situation into a concrete plot event. Early on, Seeing his sister in such a state, Zhu Shun's heart softened.... By the end, How could they bear to let their wives go out and risk their lives....