Technically, applying basic statistical understanding, armour of dementia should be 0 points.
Oh, and CoD, I don't play people like that. I haven't even encountered them yet. Guess I'm lucky. Must be hell for you if that's the sort of opponent you face, the sort of guy who won't accept that you said 'This counts as my second roll 'cos the first, quite obviously, is pointless." You say that and they say "Roll again"? Like I said, you unlucky guy. I am surprised you're still in the hobby!