I don't see how this could be that big of a problem if true. I would imagine that there are more than enough people on a medical staff to get someone a transfusion if the need arises, regardless of what one JW has to say about it.
The talking snake thing is an interesting point, but one thing people forget to mention is the talking donkey. And don't forget the witch of Endor. So let's see...we have a talking snake, a talking donkey, giant demon/human hybrids, a dragon, and a witch amongst a lot of other craziness. What does Wikipedia have to say about all of this?
From Wikipedia: A fairy tale, wonder tale, magic tale, or Märchen is a folklore genre that takes the form of a short story. Such stories typically feature entities such as dwarfs, dragons, elves, fairies, giants, gnomes, goblins, griffins, mermaids, talking animals, trolls, unicorns, or witches, and usually magic or enchantments. (Some translations of the Bible mention unicorns.)