Guest was innocent. They didn't do anything to the new girl (a pick me named Abby), yet she accused them of hitting her, and the class turned against him (Nezu is aware that she did that to poor Guest, and that absolutely disgusts him, and he already caused her explusion from school). They were beaten, and was thrown into the swimming pool despite the fact that they can't swim.

Guest eventually sunk to the bottom, losing consciousness.

Class 1-B were going to go for a swim in the pool as they were new transfers, when they immediately saw Guest, worrying immediately even though they haven't met Guest yet.