Board Thread:Off Topic/@comment-23790511-20150210221108/@comment-23790511-20150211192908

Zombie implies that person was brought back to life but is now mindless. In this case, new life was planted into their already dead body which was experimented on and modified to the point where the deceased would be unrecognizable. Think of it as refilling a water bottle. You didn't "revive" the old water, you simply poured new water into the exact same bottle.