Board Thread:False Info and Speculative Discussion/@comment-4815136-20140817115322/@comment-5690373-20140902232729

82.120.143.143 wrote: Yes, and yet there are two supernatural creatures to distinguish. The ones with only mental abilities in a human body and those with another body. There's a difference between the two and that's why Lydia could touch the mountain ash and Kira couldn't. There are no physical boundaries for Lydia in that case because her body is human. You have no evidence to back up the theory of the two kinds of supernatural, it's entirely unfounded speculation.

Like I said before, the simplest answer as to why Lydia could touch the mountain ash is that mountain ash doesn't work on banshees. I don't recall it ever was stated on the show that mountain ash worked on ALL supernaturals.