You know here’s how I would have liked the last special to go.
First have the mirror miss Sunset Shimmer, instead hitting the claw machine Starlight was hiding behind. The Mirror increases Juniper’s rage and she starts blasting everything trying to get Sunset as Sunset and Starlight flee. They talk to each other and agree to try to get the mirror. Juniper is still going blast crazy, zapping great chunk of the mall into limbo. Sunset manages to get a hand on the mirror but that just adds her element to the mix, allowing Juniper to get her corrupted form. Then eventually Starlight and Sunset get the mirror away from and it plays out much the same, just with Sunset contributing to the redemption conversation