User blog comment:B214/High School DxD New/@comment-66.185.206.81-20130702041713/@comment-33447191-20130702044731

Well the same thing kind of happened with Viser, Raynare, and the new Stray Devil.

Raynare, Viser, and Unnamed Stray Devil

The anime usually depicts most of the villains as looking pretty normal, then suddenly changing their appearance into montrous beings, the same could have been done to Kokabiel.

Then again, I'm not sure, this is merely speculation. But to answers your question, Yes it is disturbing.