The First Man

You float there watching the group for a moment, the three of them fairly spaced out at the moment, due to their differing swimming speeds, and you wonder who to strike at first.

The perfect moment arrives when with the woman at one end of their swimming course and the second man at the other, one of the men is slam smack in the middle, the furthest distance from his companions possible.

With a grin you click your fingers and feel the waistband on his swimming shorts snap.

To his credit, the man is so focused on his swimming that he doesn't even seem to notice, at first at least. It's not until the shorts have slid all the way down his legs, tangling around his ankles and preventing his legs from kicking that he realises his problem.

He starts to panic, at the moment, not worried about his exposure and more concerned about the fact that without his legs he likely won't be able to keep himself above the water line and sure enough his head dunks under for a moment as he struggles against his tied legs.