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Calc the explosion's surface area (we would usually calc it as a hemisphere's cap, but with how the explosion looks here, you may or may not be able to get away with making another end that uses the surface area of a cylinder instead, albeit with the bottom base area subtracted from) and destroyed part's area (which shouldn't be too hard since you've already got the radius for that), then divide the explosion's surface area by the destroyed part's area and multiply the result from that by the energy to get your final result. Btw, I recommend reading the first example on the wiki's Inverse Square Law page to get a better understanding.
