Turn the hips and shouders on the inside (preferablY) and strike across the chin/jaw at a 45 degree angle thus snapping the head away from the forward body structure (ie : exposed jugular , lead weight bearing stance) procucing a compression/twisting effect of the major ciculation and nervous systems.

The Jab? Straight punch thrown with zip from the hip. Primarily used as a distance keeper and a means to control what kind of dance it's going to be.
Establish the jab and keeping said opponent at your preferred range will come easy (see Douglas vs. Tyson). Ali jabbed people to death and weathered may storms with nothing but a good stiff jab. All those little flicks (Jabs) that you saw? Joe Frazier will tell you that it looks like a little flick, but that they were hard and draining shots to take round after round.

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ALI WAS THE BEST THERE EVER WAS.