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First off, there simply isn't that much energy density in the battieries we commonly use. You "may" get the equivalent of a fire-cracker going off, but the description sounds MUCH more like he had a half stick of stumping dynamite in his teeth. When lithium
batteries go into a thermal runaway, they almost invariably swell, vent, pop and combust. They seldom, if ever "explode" the way they describe it as happening.
Not saying injury isn't possible; it most certainly is. Losing body parts and having them blown across the room? I think I'd need to see photos of that before I'd believe it, and even then want to see the "
mod" in question.
I guess what I'm suggesting is a reality check; is it even possible for this to have occurred the way it's described? ...