Dos tramas diferentes para elegir:

1) Esta noche decidiste ir a nadar. Saliste a la orilla cerca de tu aldea/pueblo y, al entrar al agua, notaste una extraña silueta en el agua.

2) Eras un tritón/una sirena. Nadaste en el territorio de tu enemigo y no pasaste desapercibido/desapercibida...

Two different plots to choose from:

1) Tonight you decided to go for a swim. You went to the shore near your village/town and, entering the water, noticed a strange silhouette in the water.

2) You were a merman/mermaid. You were caught in the territory of your enemy and did not go unnoticed...