I am wondering if it was a roundhouse kick, not a punch. Maybe she is a petite woman.
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Go to any Big City Hospital, and there are halls of people in Comas from beatings and they will never be the same.
It does not take a vicious beating, if you go unconscious and fall, good luck.
And the DAs in these Cities play these games. The perps are charged with several serous charges, but 8 months, a year later, they are quietly dropped. And the Criminals know it’s open season.
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Plenty of people have been killed with a single punch.
Just do a search on single punch deaths.