What I find implausible is the idea that although not killed and remaining in play with one wound, that when activated with the one wound remaining that it is invulnerable? How do you figure? Durring the activation it has one wound and its ap to spend but where is it invulnerable? If it were to take damage durring its activation it would lose its remaining wound, "not die", and its activation would end till it could reactivate at the close. Invulnerable is nowhere in any explanation of the rule itself or any rule in the book.