Board Thread:Legitimate Canon Questions/@comment-26742635-20150721085855/@comment-4091815-20150722185855

Johnny Warren wrote: So to you supernatural is only a synonymous of Shapeshifters (wolves etc)? Since you constantly say that all the weaknesses of the shifters are the weaknesses of the supernatural beings and nothing else. all other creatures for you are human being when of human  they don't have anything but the physical aspect. Deaton made an absolute statement.

"nothing supernatural can cross mountain ash"

The point of the line was to bring into focus that the Doctor's creations are not supernatural.

They are not supernatural because they can cross mountain ash.

By the show's definition, anything that can cross mountain ash without effort isn't supernatural.

Lydia can and has both crossed and handled mountain ash - she is not supernatural.