Read Thread: A Vampire Called
You could always offer him a stake dinner.
Set the table with your best china and silverware. If a vampire can't go out in the sun (not counting the recent spate of hunky vampires on TV) and the moon is reflecting sunlight, why can they be out at night in the moonlight?
Because vampires aren't real and you're overthinking this ;) Back when people thought they were real, they also thought the sun was orbiting the earth and the moon was made of cheese. My favorite vampire movie is now going to be a series on FX. Can't...