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I don't believe the windows were billed as "unbreakable" but as "bulletproof". And a demonstration of actual bulletproof glass would yield glass that is damaged like that. The bullet just doesn't PENETRATE, which is the purpose of bulletproof things.
Mind you, the steel balls thrown at the windows are not a valid "bulletproof" test, as that isn't anywhere near the penetrating force of a bullet fired at the glass.
