A dragon in a zombie apocalypse?!

Derek was turned into a zombie
but he wasn't like the rest
he still had a conscience
but the way he was turned wasn't by a bite
he didn't want to remember it at all
but it haunted him constantly
one day a dragon appeared in front of him
it didn't make sense
why was there a dragon?!
it was a zombie apocalypse
what was a dragon doing here?!
was this just some fantasy?!