She is a spoiled bi**, and had swimsuit on anyway... he was a bit too harsh, that I agree, and it is strange that he was too weak to drag her to the pool.
I remember in elementary school, when a fatso did not want to run during PE our teacher had us to keep kicking him in the butt until he starts to move. Got the job done. Teachers are too restricted novadays, and they are even blamed for pupil's laziness.