I would have thought it was dead, too. Actually, I had one that looked a lot like that, and I waited several days past being convinced it was dead before I culled it. It simultaneously had a blood ring and veins - it's the egg that was really confusing me out of this batch. When I did finally cull it, there were no veins left, the embryo was dead, and it had brown slime on it, just like the brown slime in the 'rotten' egg I pulled out. One other egg in this batch had signs of bacteria in it, but was removed for candling clear. I'm pretty sure one of the seller's hens has a reproductive infection, since the most common reason I can find for bacteria in an unbroken egg, without effecting all of the eggs, is the probability that it was there before the shell formed.
I suspect that even though the embryo was still alive when you opened it, it wouldn't have survived very much longer.