In the original story, why was Dumbledore willing to sacrifice himself? The reason was actually quite simple: his strength was insufficient to completely eliminate Voldemort. Besides, he was no longer young, whereas Voldemort was relatively young and possessed numerous Horcruxes. Dumbledore understood that he no longer had the power to thoroughly destroy Voldemort.
However, things were different now. Having practiced morning exercises with everyone for three years, learned Ye Feng's simplified version of the Mana Cultivation Method, possessed numerous talismans, and led the Hogwarts students through the Battle of Hogwarts, Dumbledore figured Voldemort had what it took—not a single chance.
Therefore, let alone Dumbledore, even Headmistress McGonagall and the others were not the least bit worried about Harry meeting with any accidents, even though Deathiers—Death Eaters had caused a massive uproar shortly before during the Quidditch match and conjured Voldemort's Mark.
Chapter 240