I had seen that picture earlier today and it also jumped out to me. This man is very lucky, and even with luck I am not sure how he managed to be close enough to the blast for his clothes to get properly shredded, yet still far enough not to get any noticeable injuries. I would expect to see some major bleeding, and, considering that he was close enough for his shirt and pants to be ripped, significant internal injuries from the shock wave that should have definitely prevented locomotion. A really weird picture.
Several of the victims in the uncensored photos have similar shredding. It looks like most of the force of the blast was directed horizontally at ground level.
Looks like he is or was wearing blue jeans. A high speed blast of small glass fragments could have acted something like a sand-blaster, shredding the front of his pants. He's lucky, if being in this sort of circumstance can ever be called lucky.