User blog comment:Omega natsu2/Fairy Tail Zero: Dances with Blades, Review./@comment-24039250-20141023043642/@comment-7418318-20141024073103

But then why would she go off with Precht and leave Zeira behind? Wouldn't that carry the danger of Zeira just disappearing once she's out of range of Mavis magic and thus expose the whole matter to the other two?

Though it could explain why Yury reacted oddly to her. Maybe his eyes tell him that Zeira is there, but his other senses tell him that nobody is there... or maybe he's somehow feeling the magic of the illusion, but due to not knowing anything about magic doesn't know how to interprete this input and thus just thinks of it as Zeira giving off an odd vibe.