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Highlights:
To say All For One's early life was tragic is an understatement. He and his brother, Yoichi, were born to a sex worker. Even in the womb, All For One was sapping his mother's and, to a lesser extent, his brother's life force. Prior to their birth, the sex worker suffered from hardened growths on her arm. After their birth, she passed away, and the growths disappeared.
One year later, the glowing baby and reports of emerging meta abilities appeared.
All For One was merciless (a meta ability stollen from his mother). Yoichi, on the other hand, was frail but kind. He served as All For One's possession.
One day Kudo and Bruce Lee (members of a resistance group against All For One) rescued Yoichi. Sadly, All For One caught up to them. He grabbed Yoichi and literally tore him apart. All For One blames Kudo for his brother's death and seeing Bakugo reminds him of what happened.
Back to the present: The battle between Bakugo and the young, All For One is brutal, but Bakugo gathers every bit of strength he has to do enough damage to render All For One a baby.
The child sends a spear from his mouth out at Bakugo, who catches it in his teeth and sends it right back with an explosion. "Nightly Night, All For One!!" Bakugo says before collapsing with a victory fist in the air. "Give em Hell, Izuku!"
Unfortunately, any stollen quirks were not returned to their owners. Not even Hawks.
NOTE: The events of this episode take place in Volume 40 of the manga.