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I've had that happen on night dives when I didn't have a camera. If my light was pointed unintentionally at a sleeping fish, a harbor seal would streak in and eat it.One thing I've observed a couple of times now is not so much the divers causing damage (though that can happen of course) its more the presence of the diver-photographer altering the 'balance of power' in the local habitat...
On night dives some of the more enterprising predators follow the photographers around and can gobble up a stunned subject at the edge of field just as the super bright video light moves on to the next one!