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Your "rapidly expanding bright area" could be bubbles of dissolved air being shaken out of solution by the passing shockwave
Why would you expect the distance traveled by the light before becoming too dim to see would be related to the depth of the explosion site?
DoctorBeaver devices that explode need a form of detonation. That would be the pre-flash before the final explosion. Just like dynamite needs the blasting cap to make it explode.
The flash seemed to expand