And they brought up something I had never thought of before- could vampires get infected by the zombie virus?
That was the very first thing I thought of when they said one of the vampire's weapons would be their bite. I thought, huh, if the zombie virus is transferred via bodily fluid, would that infect the vampire?
Then I remembered that vampires, like zombies, are undead. Like a zombie bite, a vamp bite carries something akin to a virus which rids the victim's system of anything human, including the blood (which is why vamps don't feed on each other -- they need fresh, human blood, like zombies need fresh, human flesh).
So in a manner of speaking there's nothing human or "alive" left once a person becomes a vampire. So how can a zombie virus kill its victim and bring them back, if the victim is, for all intents and purposes, already dead?
And I find it interesting that they never really did address that. Again, though -- a cool episode. Definitely aimed more at us horror geeks than the typical Deadliest Warrior fan.