Board Thread:False Info and Speculative Discussion/@comment-24.130.28.230-20150721180826/@comment-4091815-20160202023831

That actually was stated in the same episode.

"He says the idea is terrifying but even more concerning is how Tracy got across the Mountain Ash. He reiterates the fact that no supernatural creature can cross an ash barrier. This leads to the conclusion that Tracy was somehow a non-supernatural werewolf-kanima hybrid. Deaton says if she wasn’t born or bitten then she had to have been made.

He says someone is trying to make supernatural creatures with non-supernatural means blurring the lines between science and the supernatural."

I don't have time to grab the dialogue for you now but I will when I get a free minute.