Once in the tensile region, the speed of the actual defect (crack) is in excess of 8,000MPH. To the normal eye, the glass piece fails almost instantly. Basically, it self destructs into thousands of small diced pieces as intended. Therefore, one would expect the failed glass to be safe. However, as one can by the videos, these pieces can remain interlocked and can fall as large interlocked “chunks.” Naturally these chunks have the potential to injure anyone underneath.
Thus, in this configuration, tempered glass cannot be considered “safety-glass.” Showing that there is risk involved with having tempered glass elevated above public access walkways, etc.