User blog comment:Ninja-Sensei/Episode 187: Change, review and commentary/@comment-173.66.184.250-20140624010337/@comment-7418318-20140625113545

The eye only opened because it came into contact with sunlight. If it opened after the drape was already over it, it would have contradicted the story in a very fundamental way.

But if the drape was ripped lose by wind or an accident (why do Conny and Sasha suddenly pop into my mind as possibly messing up and causing this? ^^), allowing the sunlight to hit the eye and then it opened, that could have worked.