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[–]magnora7[S] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I don't think it was a second explosion, it was just the shock waves. The "first explosion" was the combustion, and the "second explosion" was the low-pressure shockwave imploding to fill the space vacated by the explosion, and then going outward after it imploded. At least that was my take on it