The glass did exactly what it is designed to do, break into small pieces. It is called tempered glass. All of your windows are the same way, except for the windshield. That is by law required to be "safety laminated glass" (in the U.S. anyway, there used to be countries that allowed glass similar to your rear glass to be used in the windshield) The tempered glass like your rear window will shatter into a million pieces and you may get lots of tiny cuts or "nicks", but you can't get seriously cut with it. It is actually very strong glass and has to be hit just right to break. He obviously hit it just right. :o
oh ok, thanks for the great explanation.. yeah i never knew that a human head could break glass that thick..but apparently it's possible...i guess i was thinking that the rear windshield would be the laminated glass as well.. but as you mentioned... do only as much as the law says right?
hmmm afraid to see the quote now...gonna be heck expensive...