As the zombie sailed over the Castle wall, it simply disappeared. In fact, every time a zombie was killed, it simply disappeared into the earth below it. More and more fresh zombies dug their way out to equal the number that was there before.
It was almost... purposeful.
However, the reappearance of new zombies were quite slow, leaving a path to the Castle Gate open if they were quick enough to follow before the zombies finished digging themselves out of the earth.
Inside the Castle Gate, Death awaited, bony visage set in a permanant grin as he floated, scythe leaning against the ripped holocaust clad cloak covering his shoulder.