Do you think the flood had anything to do with wiping out the nephilim? Maybe there were little or no humans left and just the nephilim were left so the flood was needed to restart.
I do think their activities were bhind most of it. But I also think some Nephilim survived the flood (or the fallen angels created more Nephilim, although in more secretive ways), which is where we get giants like Goliath later.
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