"...Princess Celestia won't allow that, Barnon. Unless I could prove that our Portals do not cause any ill rifts, alterations or fragments to reality... but I can't here. I'd need my labratory. I've been looking. There is no trace, whatsoever, of Ponies in your... Universe. Which means, since we aren't on the same dimension... both of ours are at risk of my continued stay here." She explains, sighing softly.