I have seen some pretty strange things happen while playing UO so I’m not going to say it is flat out impossible but, I just did some experiments allowing a character die as a GM healing/anatomy cu sidhe was attempting to heal the character. Each time I would hear the bandages apply after gray screen but not once was my character resurrected. I repeated the experiment five times with identical results.
I did discover that, once the cu sidhe had started the heal, it did not seem to matter how close I was to the pup when the heal went off.