This was inspired by a simple thought: What if Nuka wasn't quite as dim as he let on? He could have been rather intelligent and just hiding it for his own benefit. Zira wouldn't have cared for him either way, so what would he have to lose? With that said, I think it's safe to say he'd be smart enough to inform a swarm of hungry crocodiles of a potential meal. What if that had worked out for him? "Well, I finally got your attention didn't I, didn't I?"
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