Dash somehow beats Applejack, in a surprise turn; and Applejack looks DEVASTATED. Rainbow Dash won't stop doing loops and hoof-pumping, while Applejack buries herself under her hat, Twilight rampant in her note taking. Arnon surmises that Applejacks strength must all be in her back-hooves, then; the Dash win really wasn't expected, but throttling through the air front-hooves first probably builds up some frontal muscle mass. Or something.