There are some parts of the story that seem familiar enough to it. But Amara's words give just enough of a twist to it that Bigby isn't entirely sure they are thinking of even remotely the same thing here. Murderer, monster, goddess, witch, sure-- But he's pretty sure no one, not even modern mundies, would call a siren a superhero in any sort of way.

"They're humanlike beings who sing to lure sailors to their deaths," he summarizes. Not like he couldn't say more, but for one, Bigby knows he's not exactly the person with tons of knowledge about this sort of thing, and he's also just pretty sure this sums up the most important parts well enough. "Where I come from, anyway. And all the stories about sirens in another world I've lived in were all about that as well."