But more than anything else, a punch like that puts a terrible picture in your head: You can see this black, spreading stain just under your skin, all of your body's essentials bleeding out and filling spaces where they don't have any business. A punch to the head can make you feel dizzy or woozy or sleepy, but it doesn't hurt, exactly. A punch like that one, like the one Hopkins slipped into De La Hoya, makes you feel as though you're about to die.

Chris Jones in Grantland on the art of the body shot knockout.