who flounder in the depths of ignorance.

Those who (flounder) heedless in a flood of confusion

So let them flounder (in their talk) and play until they meet the Day which they are promised.

And to make that point even more visual, I swam under the shrimp boat and made this picture of the guy shoveling this bycatch into the sea as trash and photographed this cascade of death, you know, animals like guitarfish, bat rays, flounder, pufferfish, that only an hour before, were on the bottom of the ocean, alive, but now being thrown back as trash.