I'm scratching my head here. You're saying he doesn't know if Godzilla is gonna eat the bastards or not, so he should not use the word "prey," even though he said that while looking at Godzilla hunting down the MUTOs to kill them, and that behavior fits one of the definitions of the word? So what you're insisting is that Dr. Serizawa totally thought Godzilla was gonna eat them when he said it, and was ultimately proven wrong when Godzilla just peaced out without eating, but that is not surprising since, as you said, he had no idea if G's gonna eat them or not? Or are you saying that when Serizawa said it, that automatically made his line the word of god that had to be fulfilled like chekov's gun and it's a gross oversight for the filmmakers to not show Godzilla eating the MUTOs as Serizawa was blindly guessing?