Fluttershy is so embarrassed that she doesn’t practice enough and is very embarrassed to be on stage that she ends up peeing her panties and wetting her skirt while Twilight Sparkle is also embarrassed but, Twilight farts
With there being an edit of flutter-shy and twilight wearing underwear when twilight knows she got over stage fright wearing a corset and panties when flutter-shy is blushing wearing a bra and panties. With flutter-shy getting over stage fright when she wet herself getting her skirt soaked and also has urine stains dripping down her legs when at the same time she wonders what twilight had recently when she farted right in flutter-shy’s face.