So, it's a psychological backlash for her blocking out the itch?

Yay more crazy Twi! I'll admit you've got me scratching my head about where it's all leading. I originally thought this would have Twi straight up murdering somepony, but its defied my expectations so far (which is perfectly fine). I enjoyed how you mixed in actual show events with everything as well. I look forward to more!

Still just as deliciously ambiguous as ever.

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Well, that is what Twilight suspects it could be, but as for what it really is, I'm not in a position to say...

This is truly terrifying.