Around seven o'clock in the evening, the campus found itself full of blue butterflies. They appeared everywhere, even indoors.
The butterflies were illusionary ones crafted by Kaleb but they looked like they were real and if you touched them they felt just like an actual butterfly. If you did let one land on you then you would feel a moment of peace and a fond memory that your character has of Nate would come to mind. Afterward, the butterfly would disappear.
After about 15 minutes all the remaining butterflies would fade away.