Grazing left hook right on the sweet spot of the behind the ear, that little bump called the Mastoid Process.
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Due to its proximity to both the brainstem and vestibular system (the little bundle of nerves responsible for balance), it's one of the "sweet spots" for a flat dead knockout.
Take your index finger and just press on it or even give yourself a little chop, shit hurts if you're in the right spot. Even a grazing blow from a guy with Prates' power in the right spot can put you out the fuck cold. Of course, a clean hit to the temple is a bit better (thinner bone) theoretically, and sending someone jaw spinning usually works, it's always been funny to me that the bullshido "pressure points no can defend" shit from the 80s has the teeniest, tiniest bit of logic behind it just based on our nervous system.