Each of you, and your classmates grabbed a water rifle from the basket, and felt how loaded with water they are. This was not going to end well for you, because you were about to feel more pain from your changes if one of the other classmates shoot water at you, which will cause your mermaid change to grow further.
"Alright, let's have you all split into 2 teams for this exercise, class," the coach says. "I'm thinking, Kind Vs Ruthless." You raise your hand, hoping that you would be safe. "Yes, kind kid," the coach says. "Shouldn't we go over some safety guidelines for this exercise?" You ask. "It's just water, kid," the coach answers, while rolling his eyes. "Alright, ruthless kids get on the left, and kind kids get on the right." Apparently, the coach didn't care about you, because he was too distracted with his job.