Talk:My Little Pony Equestria Girls: Spring Breakdown/@comment-11611755-20190207204649/@comment-1031724-20190208032513

(sigh of relief, followed by a sigh of exasperation) They really need to stop doing that. Twilight, Celestia, AND Luna were aware of the consequences of hiding the Memory Stone in the human world instead of destroying it, as it nearly ruined Sunset's life forever.

I guess it can be explained in that they either thought it was powerless now, or just threw it into the ocean, hoping it would be lost, but it fell into a previously-unknown portal... Think about it, the encounter is at sea, that actually makes sense.