Board Thread:False Info and Speculative Discussion/@comment-24.130.28.230-20150721180826/@comment-27547895-20160130231321

The show stated that a supernatural should not be able to pass a mountain ash barrier. Exceptions to that rule have been established. Therefore, banshees not being supernatural is not the only possibility. Not to mention, there are also two other very reasonable possibilities, besides these two.

Because there are other possibilities than what you consider to be correct, you cannot state that what you believe as correct or canon, until it is explicitly stated. I'm sorry, but there are too many exceptions (and yes, just one is enough) for you to say that it has been explicitly stated because of this one scene addressing chimeras.

If you cannot say for sure that what you believe is correct, you cannot pass that headcanon as canon.

That's just the way it is.

I'm sorry that this is difficult for you to understand.