wait.
if Nandor knew that the only way to reverse the transformation was to kill the vampire that sired Guillermo...
he was going to travel the world...with his best friend...go back to his home...turn Guillermo at the banks of the Tigris
in s3 finale, after Guillermo had cornered Nandor, proving he can have violent intent towards him, Nandor says, "yes, yes. this is what I've been waiting for. you've passed the test"
but he wasn't talking about being a vampire...
he was talking about what he would have to do after...