I'd venture the guess that this rainbow-shockwave is the result of highly compressed air from a first blast to the left, immediately followed by the
blast to the right, this compresses the air and the third blast in the middle of the two previous blasts presses the air up and sideways, which
results in the perceived peculiar shape of the blastwave.
Ya that is an awesome blast, right after the shockwave hits you can here the shrapnel and rocks ricocheting around.
I dont know what causes that "rainbow" effect either but if you pause it at just the right moment, you can clearly see 3 of them side by side.
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