Dale noticed that both Twilight and Lyra put their heads down and did . . . something to the pie. Their horns both glowed briefly, surrounding their slices in auras of colors. As before, Twilight’s was magenta and Lyra’s was golden. Further observation was still needed, but every unicorn had had the same color no matter what they were doing, so there was no way to identify what kind of ability they were using by horn color.