Hold on. This image gave me an idea:
What if there's a basic assumption we're making that isn't true? What if Cueball and Megan aren't adults?
Stay with me here: When you were a kid playing with your friends, everything was larger-than-life. Outside in the backyard with some sticks? You're pirates fighting off Blackbeard's men.
On the playground talking about this totally awesome TV show? Soon you'll be acting it out as the protagonists fighting against a Big Bad from your imaginations.
At the beach during high tide when there aren't many other people around? You build a sandcastle and a moat or wall to keep the water out, using sticks and rocks to act out a war between the castles. Suddenly, the water starts to breach the moat/wall that you made and you get scared because your castles are about to be destroyed. Maybe you try to get to higher ground, standing on piles of sand. Being as young as you are, you don't understand exactly how the world around you works. The water is rising really fast. What could be causing it? There's a river by your house, so that's probably where the water comes from, and the river must get its water from the rain, obviously. But does that mean it rains over the ocean? That'd be weird. There's already water there, after all...what if there are more rivers? What if you haven't seen them because they're underground? The world is a lot bigger than you thought, and you're kind of scared because now you realize that you don't really know anything.
Time is a metaphor for growing up.
EDIT: This goes along with the The Blue Lagoon stuff, but I'm saying that they're not stranded or anything, just young and ignorant about the world.
Does anybody have any idea of what the hell energy is? It's the thing that, when applied to something, gives itself to the thing so that the thing can expend it, applying it to other things in multiple forms of it. What the hell is it?