Today was the first time I was able to kill the Lich Skeleton because he decided to wander off on his own, so I took advantage of the opportunity to pin him down. The problem is that after he died, his army stayed behind and did not disappear; they have completely destroyed everything and do not appear to be planning on leaving. I was under the impression that once the leech skeleton died, the army would also die with it. Am I wrong, or is this a bug of some kind?