Board Thread:News and Announcements/@comment-6493589-20151008152837/@comment-26339753-20151013141953

I wasn't saying that was my theory-I'm almost 100% sure that Raven is Yang's mother. I just think we're getting a little to complacent with our fan theories, and starting to canonize them. I'm just cautioning that we technically don't know much for sure, and RT could prove to be better writers than we give them credit for, and pull some unexpected twist on us.

I think the best theory I heard (aside from her being her mother) is that Raven is a projection of Yang's negative emotion, a "dark Yang" and doesn't actually exist, but is really Yang's minds way of comprehending her darker side.

Tldr, according to this theory, it wasn't Raven Neo was afraid of on the train, but actually Yang going on a sadistic rampage.