There are only two reasonable explanations I can see for shirt reacting like that. Both have to occur inside the shirt.
1) compressed gas/air (could be a shockwave, explosion, release of compressed gas etc)
2) shrapnel - but very specific as to not tear the shirt? Or perhaps the shrapnel was microscopic and the shirt was damaged.
So we're looking at at a battery pack inside the shirt being turned into a type of air gun that fired a bullet? If so, then the wound we see is an entry wound, and the "bullet" stayed inside him, in keeping with a low velocity, which would work given the proximity.
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