You jumped to quickly to square number two. Forget "re-defining." Start with "defining." You are smuggling an assumption that YOU own the original definition. Prove it.
OK, back on square one you used the word "human" twice in the phrase, "...when a human becomes a human...", which grammatically speaking, produces the incoherent and unintelligible corollary that there can be a human being who is not a human being. It is self-contradictory and self-refuting.
Cordially,