Did you notice that in RAGE HD for iPhone the mutants are invulnerable while they are entering the scene? You can shoot them while they do their initial animation, there's blood, but it won't hurt them. I was wondering if this done to keep them alive long enough to attack, or if it is simply not possible to interrupt the initial animation and switch to the dying animation.
Today I watched the "enemies" clip and it looks like in the final game you can kill them anytime. As Jonathan Wright says: "You can interact with them at the time they're doing that so it's not like they're just stuck in that particular animation. You can shoot them and kill them and everything happens as you'd expect".
That's quite cool!