User blog comment:SeraphLucifer/Discussion/@comment-3481504-20151025043959/@comment-3045936-20151030044343

It's possible that Death, never met the darkness. He may have witnessed the war or maybe wasn't directly existing like how God was and was just told about the war. Maybe at that time Death was more universal. And because of this possibility the Darkness doesn't know him, and because of this he doesn't know her power. Which is what I think she meant by he doesn't know her. Death can be a bit contradictory but he never flat out lied. His closest one was he in season 7, Dean asked him to kill God (Godstiel) but asked what makes him think he could. Until Dean, told him he that Death told him he could. But was more annoyed that he was using his statement.