[Interjecting]
So, it seems that the crux of the definition is “reasonable creature in being.” "n being" means “while alive,” but what is a “reasonable creature”? Is that the same as a “rational creature,” or does that simply mean that it would be reasonable to call X a creature worthy of protection? If the latter, there are several types of reasoning that not all people have at every time in their lives (practical reasoning, deductive, inductive, syllogistic, modal, etc.). I’ve brought it up before, but as Plato has said, we must look at a man’s whole life to determine his morally relevant characteristics. If the former, then it seems the definition is conclusory. The analytical heavy lifting (as always) would be in determining, more precisely, in what circumstances it would be reasonable to call X a creature worthy of protection.