So, the chalk he was using started bubbling with gross dark energy and suddenly flew off in front of a weird unicorn with darkness leaking from his eyes. On first glance, Kokichi decided that Sunburst should win the award for creepiest mirror ever on account of this.

Still, Kokichi doesn't seem too upset. In fact, he walks right up to the danger unicorn with a sly grin on his face.

"Au contraire, my equine friend," he effects a venomous tone as he stands before the pony, "Not all of us are simply content to draw such childish things. In fact, some of us may use it for more... Nefarious purposes."

Here he moves to grab the chalk from the dangerous bubbling aura in a show of confidence... Hope the dark magic isn't slimy.