Corrected entry: Any glass in modern office buildings is tempered glass. This kind of glass breaks into tiny, rounded pieces with semi-smooth edges. If you were careful you could easily walk on it without injury. John should not have had splinters of glass in his feet.
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Correction: Not all the glass on the floor is from the windows. Some is from the computer screens and copiers that Karl and Hans smash up along with the windows. Besides this, McClane did not exactly have the time to be careful, since he was trying to get to a place of safety while making sure there were no criminals still around who would shoot him.
Twotall