Board Thread:False Info and Speculative Discussion/@comment-24.130.28.230-20150721180826/@comment-4091815-20150723195812

You have to ask yourself who was uncertain about the mountain ash efficacy against Kira or the Oni. Derek knew it would keep her in. The Oni were blocked by it - they broke through.

The only uncertainty with the Kanima was if it would block the master too. He's not supernatural just tied to one.

The hitlist wasn't labeled "supernaturals" it's assumed but not stated as such.

Deaton said it two episodes back - supernatural can't cross mnt ash.