Board Thread:False Info and Speculative Discussion/@comment-4815136-20140817115322/@comment-42.61.226.96-20140901134428

I think its because while Lydia is a supernatural creature - Banshee, her constitution leans more toward of being human. Remember that Lydia isn't a shapeshifter, and the rest are. The Onis are demon. Hence Lydia is able to pass through since yeah, she is probably deemed more of an human than a supernatural creature