[unsure if she should be worried about a Lily, BB, Clover combo at her father,,,]

I only heard second hand, yeah, but it sounds as if he may have merged with a nightmare, of sorts. He was grieving so hard it let it consume him. . .

We'd been studying how dreams could be manifested and used to help people in the real world, so it stands to reason that a nightmare could be used for harm, too.