"Well the further she is from the ocean, the harder it will be for her to warn them. What do you think, sir? Want to take her inland?"
The man hesitates. "It sounds like I owe you one, but how am I going to carry her to my car? And what about after that? If the neighbors hear some screaming woman, I'll have the police at my door. Not that holding a mermaid prisoner wouldn't be fun, especially after what she tried."
"Oh, that's no problem." The frog captain picks up the stone you were going to use on the man. "We've been learning how to use these. Turns out there's a lot you can do with them!" He touches the stone to your shoulder and the others hold you tight to keep you from flinching away. Then he chants something.
Then he starts growing. But the others seem to have loosened their grips and you can wriggle free! Suddenly you realize you're the one who's shrinking. Before long, you're the size of a goldfish. You desperately crawl and flop towards the water, but it suddenly looks like a long haul. A frog scoops you up in one hand, covering it with the other to keep you from jumping.
"It's just like going to the pet shop! Got a plastic bag?"