The Royal Engineer's nervous expression raised the corporal’s hackles, and she furrowed her brow in confusion. He didn't seem at all afraid to face the whole crowd -- including Their Majesties -- during the demonstration, so what was this about, now? Having himself noticed the flaws in her driving, was he worried that one or both of the Princesses had also spotted their errors? And yet, of all the ponies present, surely Their Majesties understood that this was just a prototype, and a hastily organized first unveiling? 