Hiro's trying his best to think about this from Subzero's point of view -- not only are there large, complex organic life forms, but some of them eat each other. Sam's trying her best to tiptoe around the fact that honestly, parts of this whole carnivore thing are legitimately horrifying, so he butts in with some science jargon to try and lessen the blow.

"Pretty much all life forms do that to some extent, though, even the herbivores, though they stick to the plant stuff. Goes back to that whole complexity of the species thing -- the more advanced and powerful an animal is, the more other animals it can hunt as prey."

Then he pauses and amends: "Well, up until humans. We're pretty much the only species that has enough cerebral processing power to conceptualize wide-spread civilization, so even though technically most apex predators could totally eat us, we're top of the food chain. Unless you're lost in the woods with a bear."

Another pause. "This...isn't helping, is it?"