Will we get another sneak peek or is this it? I don’t think we’ll get enough to speculate about the fail safe without more to go on. Though the spoilers that reference a dragon do have me thinking it could be tied to letting Malificient loose …though that's probably stretching it.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass