I don't know...I can't seem to produce any ghost ones. They always just come out regular.

[Ingo was sitting on his haunches to do this, which now forces him to awkwardly back up before he can lay down as well. It feels too strange, to loom over Emmet like that; anyway, may as well be comfortable.]

My thought is that perhaps making the fire is a physical action, and making the ghost one would be a sort of...spiritual action? But I certainly don't know what that means.