everyone was being sorted Into two categories, well, three technically. Littles/pets, and caregiver. For example, Aizawa is a little and Mic is his caregiver.

Everyone is in line waiting to be sorted. Some like Bakugo knee what they were going to get. And others like Izuku were nervous because this is all new to everyone.

Aizawa was bored, not wanting to regress Infront of his students. Mic was preparing a play pen for the littles and a caregiver station for the caregivers