You said that you have a problem with someone claiming that the right to life is absolute. To me, I think it's in the interpretation of what you mean by "absolute".What are you even talking about? I really don't see how that fits into the conversation at all.
But still, Bug's rebuttal seemed reasonable to me FWIW. It seems like he's saying that his right to life is absolute, which outweighs the right to life of someone trying to take his. I think that's similar to my take. An innocent right to life is absolute. Someone who tries to violate that right to life has forfeited the absoluteness of his right to life.