Yes that’s the most reasonable explanation. That one of the two Korean girls found dead on Larn Island killed the other. She then dragged the dead body into the sea and tied herself to it and by the weight of body she tried to drown herself.
For me personally I would go for some one tried to rob or rape the girls walking alone on the beach at night and then tried to silence them by killing them.
But I guess that would not look good when so many people coming to Thailand for the New Year holidays and remember the girls walked hand in hand the day before.
But during the years I seen so many foreigners strangle themselves with telephone wires I am not surprised about anything anymore the Thai police finds normal.
Let me also say that it makes me sick when Thai TV shows dead bodies on the beach on TV and people touching them. I really do not understand how you can keep a crime scene clean when flocks or reporters trying to get a close up of the bodies.