Sigma, who had just checked out a book from the school's library, was rushing to physical education before coming across three pegasi who were in his previous class. It seemed as though they were all talking to each other about P.E related activities. Maybe they they were going to the gym as well; maybe Sigma should stop and talk.
Sigma walked up to the three pegasi, opened his mouth, and then closed it again when he realized he had nothing to say. The group wasn't given any tasks to perform, so there wasn't anything he could collaborate with them on, but as the same time, he had to say something.
"Uhh... hi." the white unicorn feebly said.