Rip

What if Starlight ended up ripping up the spell scroll? How would she reflect on the armageddon she would indirectly inflict on Equestria?

Starlight, in a moment's notice, ripped up the only thing that could prevent any irreparable damage from ruining the timeline and by extension, Equestria.

And she did it in a time where she was too emotionally wrecked to reflect. However, she ends up having some time to think about what she had done. And soon, regret sets in.