[ Now THAT is a handy spell, and both eyebrows arch slightly as the metalbender turns to give the princess her fullest attention. Would that they had something similar back home to use during criminal investigations.. There is also some polite chirping as her Pricklemane finally wanders over, flicking its tail at Luna in a cheery wave. ]

They certainly have a wide variety of spells. I suppose that means we can rule out anyone from their world being responsible for opening this. [for the moment, anyway]