What happens in All Might vs All For One?

The second battle between All Might and All For One occurs at Kamino Ward and is broadcast live across Japan. All Might arrives already past his time limit, fighting in his emaciated true form for the first time publicly. He uses every technique he has — and ultimately delivers the United States of Smash, an attack that destroys the remnants of One For All entirely, defeating All For One but leaving himself permanently powerless.

Why is this fight so significant?

It's the end of an era. All Might has been the cornerstone of hero society — the singular figure whose existence kept villain activity suppressed. This fight is his final performance. The stakes are enormous not just physically but symbolically: if All Might loses publicly, hero society's psychological foundation shatters.

How does All Might win when he's barely holding on?

He wins because he stops holding anything back. Every bit of One For All that remains goes into one punch. There's no conservation, no strategy for the aftermath — just complete commitment to ending the threat. He accepts that this will be his last act as the Symbol of Peace before he does it.

What does All Might say after the fight?

He reverts publicly to his true emaciated form, then turns to the cameras and says: "You're next." Addressed to All For One — but also a farewell. He's telling villains not to celebrate, while acknowledging to the world that things have changed.

What does this battle teach?

That there are moments when holding something back is the wrong choice — when the situation demands everything you have, and giving less is itself a failure. All Might's final battle is his greatest gift: he spends himself completely so the world has one more chance to find its footing.