Board Thread:Speculation House/@comment-14138255-20151213162620/@comment-24099398-20151213165823

Master Moridin wrote: What seems to be going on with the Mercury and Fake Yatsuhashi thing is Emerald has some sort of hallucination power. She can make a single individual see things happening in a way they aren't.

So she made Coco hallucinate a Yatsuhashi, and made Yang hallucinate Mercury attacking her.

Edit:  Ninja'd???? by EnderJRV

Damn site isn't wanting to update when I refresh pages lately... I think you explained it better :P I like the term "hallucination" more. It suits the ability.