Question: I don't really understand what their plan was in luring it into the pool. Did they think electrocuting it would kill it? Why would they assume that, when nothing so far has killed it?
Question: Why did Jay look like she was going to swim out to the boys on the boat to have sex with them if it turned out she never did?
Answer: The scene was meant to show that Jay was seriously considering having sex with a stranger and passing the curse on, as she was told to do. At the last minute she changed her mind, presumably due to guilt.
Answer: None of their previous attempts worked, so they were willing to try any method they could think of to kill it. If electrocution didn't work, then they would know they have to keep trying and hopefully will find some lethal manner of eliminating it.
raywest ★