Conversation so far:
What started Muhammad Ali's career?
Muhammad Ali was first directed toward boxing by boxing coach Joe E. Martin, who encountered the 12-year-old fuming over a thief's having taken his bicycle.
Did Muhammad Ali have anyone who influenced him?
Muhammad Ali credits trainer Fred Stoner with giving him the real training, eventually molding my style, my stamina and my system.“
Did Muhammad Ali get any recognition during his amateur career?
Muhammad Ali went on to win six Kentucky Golden Gloves titles.
Was Muhammad Ali ever sponsored?
Did Muhammad Ali have any signature moves?
Darrell Foster said: Muhammad Ali's signature punches were the left jab and the overhand right. But there were at least six different ways Ali used to jab.“
Are there any other interesting aspects about the Muhammad Ali article?
Muhammad Ali's amateur record was 100 wins with five losses.
Was Muhammad Ali injured in a severe manner?
In 1973, Ken Norton broke Muhammad Ali's jaw while giving him the second loss of his career.

Question: Did he ever injure someone else severely?
Self-contained rewrite: Did Muhammad Ali ever injure someone else severely?