This is what I mean. Clearly there is a way of thinking about the vampire effect that makes sense to you, and you are willing to flex the wording of the rule to conform to that idea. Which is really totally fine, and I have no objection to your way of thinking about it. But most of the rest of us are discussing what the rule as written actually says, and confusing the two approaches is just frustrating for everyone.Only because they didn't consider this corner case. The reduces portion is not really relevant as it is only there to let us know that 0 max hit points from the necrotic damage causes instant death. All the conditions for death are still present. You can "rules lawyer" the technicality all you want. I'm going to go with RAI.