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IIRC all windows are tempered glass and any abrasion or scratch in the glass kills the tempering. That glass is impaired and to be safe, replace it. The result of a new hit ( head etc) will result in a lot of glass shards not chunks as the temper would do. This is my opinion having worked in the optical field for 40 some years.
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15 year PCA member 
1972 911 E Coupe - gone now
1987 Mazda RX-7 2+2 - still cooking
Swift DB-1 FF & Swift DB-3 F2000 -not forgotten
1979 911SC 3.0 & 2000 Camaro
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