I bet you that Stipe hit Werdum far harder than it appeared,,,,, PLUS, a well placed lighter punch can often do more damage than a poorly placed harder punch, has to do with not only the angles that the punch is thrown BUT also the angles of the head when its impacted etc etc,,, dudes that don't fight are usually the most clueless about this. I would not argue Werdum has a great jaw but I would argue it is solid, take a look back at his last several fights, he gets tagged with some solid shots and fights right threw them.