It was hard enough to kill a vampire. You could stake them down and turn them into dust and ten years later someone drops a drop of blood in the wrong place and *guess who's back*? They returned more times than raw broccoli.
-- (Terry Pratchett, Feet of Clay)
The return had not been planned, these things never are, but as with most things that go unplanned, one starts as one wishes to continue.
Let's just say things didn't go as expected