Board Thread:False Info and Speculative Discussion/@comment-24.130.28.230-20150721180826/@comment-27728040-20160203200417

So I didn't bother reading all the millions of messages in this thread, but it seems like it's going in a circle anyways.

Personally I would simply interpret the show like this: Deaton clearly stated that nothing supernatural can cross/touch mountain ash... well, since Lydia was able to touch it without problems, either:

1. Deaton made a mistake.

2. Lydia is not a supernatural creature.

And since at this point we don't have more info about it, it's useless to argue. So we'll just have to wait until it's clarified in the show. The End.