Looks like some poly blend maybe. Subject to extreme heat and pressure it could melt in clumpy strands like that. It appears to me that it falls back down as he runs away.
It seems he was virtually at the center of the blast and had his pants blown off. I begin to wonder how he could have been right there, and staggered off down the street if the bomb was filled with shrapnel of any kind.
Just open the box and see
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