The Fallen Mermaid

It happened, when john went over to get the ball. As he walked towards it, he could see something floating around in the far distance 

Once he strengthened his vision to see who or what it was, he quickly submerged himself into the water, and propelled himself over to it. 

[Aqua] John thought to himself 

Like a jet ski, he propelled himself through and under, the few people who were swimming quite far from the shore, and passed them in a blink. 

He wasn't sure if they noticed, but didn't care. As he was about to reach it, the person suddenly got submerged into the water as if it was being dragged down. 

Seeing this, john began to gather more wind and water behind him, and then let it burst propelling him at nearly the speed of a water cannon 

When he finally reached the person, he could see the person's figure a lot better. It was a young girl, younger than john even. This girl was being dragged down by a girl who was half naked.