give me a sec I will find the deposition that has it in there.
It is from this document
There was a quick flash right before explosion, in first second.
I had made this image many breads back.
>>10183159 pb
"You can see a bright flash which spread across the ground with the brown cloud forming. At this point it is fairly low energy.
You can then see off to the side a possible implosion and then immediately followed by a very high energy shock wave. From the other angle you can see how things are sucked inwards briefly."